Monthly Archive: December 2010

Bash Script to Install Ubuntu to CR-48 through USB easier (Updated)

Update (01/18/2011): Thanks to flyboy415’s comment below, it inspires me to add an optional parameter to the script that allows you to customize the path of your USB drive. You probably read my another post shows you how to mount the USB drive manually in Chrome OS.  Now you can run this script with that directory that you created:

bash ubuntu.sh /tmp/usb

I spent last several days writing and testing the script which could help some of you installing Ubuntu onto CR-48 using USB drive a little easier.

This script is inspired by Jay’s script over at chromeos-cr48.blogspot.com. It’s also based on the steps over at the Chromium projects website. However, it uses your custom generated rootfs.bin in the USB drive instead of downloading the pre-made image.

Below is the entire script. You can either copy it directly to gEdit and save as .sh file or download the same script at github.

The Code

#!/bin/bash
#
# This script is used to install Ubuntu to CR-48 (or any other Chrome OS devices) from USB drive
#

# Display the purpose of this script
echo -e "n==============================================================="
echo -e "This script helps you to install Ubuntu on CR-48 (or any other nChrome OS devices) from USB drive a little easier.n"
echo -e "NOTE: You can pass the location of your USB drive as the only nparameter of this script"
echo -e "For example, bash chrome-os-ubuntu.sh /tmp/usb"
echo -e "================================================================="

# Disabled powerd service
echo -e "nDisabling power management service..."
sudoV="`initctl start powerd`"
sudoV2="`initctl stop powerd`"
if [ "$sudoV" = "" -a "$sudoV2" = "" ]
then
 echo "Make sure you run this script in the root account. Enter the following to enter root:"
 echo "sudo su"
 echo "After you are in the root account, run this script again."
 exit
fi
initctl stop powerd
echo -e "Power management disabled."

echo -e "nChecking the partitions size..."

# Do the following tasks if they were not already done
resizeV="`sudo cgpt show /dev/sda | grep 12103680`"
if [ "$resizeV" = "" ]; then

 # Resize the partitions
 echo -e "Resizing the partitions..."
 sudo umount /mnt/stateful_partition
 sudo cgpt add -i 1 -b 266240    -s 12103680 -l STATE   /dev/sda
 sudo cgpt add -i 6 -b 12369920  -s 32768    -l KERN-C  /dev/sda
 sudo cgpt add -i 7 -b 12402688  -s 10485760 -l ROOT-C  /dev/sda

 # Destory the stateful_partition
 echo -e "Clearing the stateful_partition, it will take some time..."
 sudo dd if=/dev/zero of=/dev/sda bs=131072 seek=1040 count=47280

 # Restart the notebook
 echo -e "nYou need to reboot your notebook in order to continue.nMake sure to press CTRL + ALT + => (Left arrow), login as chronos, and run this script one more time after Chrome OS was rebooted.nPress ENTER to continue or wait 1 minute to reboot automatically."
 read -t 60 iputs
 sudo reboot

fi

echo -e "The partitions are resized."

# USB drive verification
usbV="`mount | grep sd | grep -v sda`"
listing="`ls /media | tail -n 1`"
if [ "$1" == "" ]; then
 usbDr="`ls /media/$listing`"
else
 usbDr="$1"
fi
while [ "$usbV" = "" -o "$usbDr" = "" ]; do
 echo -e "nPlease insert the USB drive with rootfs.bin, make_dev_ssd.sh, and common.sh in it.nPress ENTER when the drive is inserted.nIf you are not signed on to Chrome OS. Please press CTRL (left) + ALT (left) + <= (left arrow) to return to the graphical interface and sign on in order to detect yout USB drive by Chrome OS. Press CTRL + ALT + => (right arrow) to return to this script and press ENTER to continue.n";
 echo -e "Note that if you already mounted your USB driver manually, you can kill this script by pressing CTRL + Z and rerun this script with a parameter that points to the path of your USB drive.nFor example, bash chrome-os-ubuntu.sh /tmp/usb"
 read ready
 echo -e "Detecting USB device..."
 sleep 10
 usbV="`mount | grep sd | grep -v sda`"
 listing="`ls /media | tail -n 1`"
 usbDr="`ls /media/$listing`"
done

# Mount the USB drive
echo -e "nMounting USB drive..."
if [ "$1" == "" ]; then
 usbDir="/media/$listing"
else
 usbDir="$1"
fi
echo -e "USB drive is mounted."

# Determine the existence of three required files
rootfs="`test -e $usbDir/rootfs.bin;echo -e $?`"
makeDev="`test -e $usbDir/make_dev_ssd.sh;echo -e $?`"
commons="`test -e $usbDir/common.sh;echo -e $?`"
if [ "$rootfs" = 1 -o "$makeDev" = 1 -o "$commons" = 1 ]; then
 echo -e "nSome of the required files cannot be found on the drive.nMake sure rootfs.bin, make_dev_ssd.sh, and common.sh are copied to the drive and reinsert it to the notebook.nRestart this script when you are ready."
 sudo umount $usbDir
 exit
fi

# Copy rootfs.bin in USB drive to /dev/sda7
echo -e "nCopying rootfs.bin to /dev/sda7, this will take some time..."
sudo dd if=$usbDir/rootfs.bin of=/dev/sda7
echo -e "rootfs.bin successfully copied."

# Mount /dev/sda7
echo -e "nMounting Ubuntu partition..."
sudo mkdir /tmp/urfs
sudo mount /dev/sda7 /tmp/urfs
echo -e "Ubuntu partition is mounted."

# Copy cgpt and /lib/modules/ to Ubuntu partition
echo -e "nCopying necessary files to Ubuntu..."
sudo cp /usr/bin/cgpt /tmp/urfs/usr/bin/
sudo chmod a+rx /tmp/urfs/usr/bin/cgpt
sudo cp -ar /lib/modules/* /tmp/urfs/lib/modules/
echo -e "The files are copied successfully."

# Unmount /dev/sda7
echo -e "nUnmounting Ubuntu partition..."
sudo umount /tmp/urfs
sudo rmdir /tmp/urfs
echo -e "Ubuntu partition successfully unmounted."

# Decide the rootdev
echo -e "nDetermining the Chrome OS kernel partition..."
rootfs="`rootdev -s`"
if [ "$rootfs" = "/dev/sda3" ]; then
 ker="/dev/sda2"
else
 ker="/dev/sda4"
fi
echo -e "Your kernel partition is in $ker."

# Copy the kernel to /dev/sda6
echo -e "nCopying $ker to /dev/sda6..."
sudo dd if=$ker of=/dev/sda6
echo -e "Copied successfully."
echo -e "nNow is the critical time to check the above output for any errors. If there are some errors, press Ctrl+z to stop this script and correct them. By not correcting them, you might need recover image from Google to restore Chrome OS. Otherwise, press ENTER to continue."
read checkEr

# Change kernel command line
echo -e "nChanging the kernel command line..."
cd $usbDir
sudo sh ./make_dev_ssd.sh --partitions '6' --save_config foo
echo -e "console=tty1 init=/sbin/init add_efi_memmap boot=local rootwait ro noresume noswap i915.modeset=1 loglevel=7 kern_guid=%U tpm_tis.force=1 tpm_tis.interrupts=0 root=/dev/sda7 noinitrd" > foo.6
sudo sh ./make_dev_ssd.sh --partitions '6' --set_config foo
echo -e "Changed successfully."

# Generate ubuntu alias in .profile
echo -e "nGenerating ubuntu alias..."
echo -e "alias ubuntu="sudo cgpt add -i 6 -P 5 -S 1 /dev/sda;sudo cgpt add -i 2 -P 0 -S 0 /dev/sda;echo 'Swiched to Ubuntu, restart to take effect'"n" >> /home/chronos/.profile
echo -e "ubuntu alias generated."
echo -e "nYou can type 'ubuntu' (without quotes) in Chrome OS command line to switch to Ubuntu from now on.nIn Ubuntu, add the following line to .bashrc to use 'chromeos' (without quotes) to switch back to Chrome OS:"
echo -e "alias chromeos="sudo cgpt add -i 2 -P 5 -S 1 /dev/sda;sudo cgpt add -i 6 -P 0 -S 0 /dev/sda;echo 'Switched to Chrome OS, restart to take effect'""
echo -e "nPress ENTER after you copied the above alias down."
read chromeos

# Complete Ubuntu installation
sudo cgpt add -i 6 -P 5 -S 1 /dev/sda
sudo cgpt add -i 2 -P 0 -S 0 /dev/sda
echo -e "nUbuntu installation is complete.nPress ENTER or wait 30 seconds to enter the newly installed Ubuntu."
read -t 30 ubuntu
sudo reboot

Few warnings before running this script

You need to running the script under bash instead of sh, for example

bash ubuntu.sh

where ubuntu is the name of your script.

If you use sh instead, you won’t see the error messages produced on the screen and might need the recovery image to restore Chrome OS as stated in the script above.

The make_dev_ssd.sh and common.sh files can be downloaded here which are provided by chromeos-cr48.blogspot.com. You might not have these two files during the chroot installation if you chose to get minilayout instead of the full layout of Chromium OS source code.

Other requirements, such as login as root, will be provided as you execute through the script.

Issues while running the script

If you have any issues while running this script, feel free to leave a comment or create an issue over at github.

Download WordPress and Other files Directly to your Server with PHP copy

PHP

Intro

When I tried to get the development environment working with Chrome OS (CR-48), I thought since Chrome OS is primary working for the cloud, why am I downloading, editing, and testing the website files locally? I found out that my hosting provider, iPage, offers a file manager and a basic text editor to manage and edit my PHP files, and since I use gEdit as my main code editor, I’m pretty comfortable with the text editor.

Basic code editor

The basic code editor available in the control panel

I shortly found some useful file operation functions on the official PHP document, one of them is copy. According to its documentation, the source and destination can both be URLs since 4.3.0. This means that I can download the code from another website directly to my server using the server resources. I wrote a test page to test this function and it worked without problem.

The Code

<section id='fileDownloader'>
 <article id='urlForm'>
  <form id='url' name='url' method='post' action=''>
   <label for='urlInput'>The file to be downloaded (URL): </label>
   <input type='text' name='urlInput' id='urlInput' placeholder='URL' size='60' autofocus value="<?=($_POST['submit'])?$_POST['urlInput']:""?>" />
   <br />
   <input type='submit' value='Download' name='submit' />
  </form>
 </article>
 <?php if ($_POST['submit']): ?>
 <article id='downloadStatus'>
  <?php
  if (empty($_POST['urlInput'])): die("Please enter a valid download URL"); endif;
  $path = explode("/", $_POST['urlInput']);
  $fileName = $path[sizeof($path) - 1];
  ?>
  <?php if (file_exists($fileName)): ?>
  This file already <a href="<?=$fileName?>" title="Download file from this server">downloaded</a>.
  <?php elseif (!copy($_POST['urlInput'], $fileName)): ?>
  Download failed. Make sure that the URL is correct.
  <?php else: ?>
  Download completed. You have the option to <a href="<?=$fileName?>" title="Download from this server">download this downloaded file</a> or <a href="<?=$_POST['urlInput']?>" title="Download from the original server">download the original file here</a>.
  <?php endif; ?>
 </article>
 <?php endif; ?>
</section>

Note that I’m just staring to learn HTML5, so I can’t guarantee the above syntax is correct.

Questions

If you have any questions regarding this script, leave a comment below. And please don’t spam my server when testing on the test page, If you want to test it on your localhost, you can download the source code here.

A Small Fancybox Tip – Show scrollbar when viewing Large Images

Intro

I use Fancybox jQuery plugin to view large/original size of images. However, its default settings don’t setup to view the large size images. It auto resizes based on the browser window size instead. According to the documentation, the options “autoScale” and “scrolling” disables the automatic scaling and enables the scrollbar to be visible respectively. However, I couldn’t figure out the scrolling option since the horizontal scrollbar is missing when viewing a large image that is bigger than the browser width. After looked into the code generated by Fancybox, I noticed that the scrolling option is applied to other than the body element, which is what I want the scrollbars to be at (edges of the browser window). So I used onStart option to write a callback function that set the overflow property for the body element to be visible.

The Code

$("element").fancybox({
 transitionIn: "elastic",
 transitionOut: "elastic",
 autoScale: false,
 onStart: function() {
  $("body").css({overflow:"visible"});
 }
});

Below is the difference between use the scrolling option and use the onStart callback function:

Scrolling

Scrolling Option

onStart callback function

onStart Callback Function

 

Questions

All of the above options are explained in the Fancybox document page. If you still have questions, feel free to ask them below.

More Storage Space for Ubuntu on your CR-48 Notebook

Intro

I downloaded lots of files to Ubuntu on my CR-48 recently, and eventually it ran out of 1GB of free space. While I was struggling to delete the unused files in Nautilus, I noticed that there are unmounted partitions listed above the bookmarks section, especially the 6.2 GB File System.

The Process

The process for acquiring additional storage space for use within Ubuntu is simple. Just click the disk labeled 6.2 GB File System to mount it, and then navigate to /home/chronos which is your home directory inside Chrome OS. Inside this folder, you can do the normal file operations like in your Ubuntu home folder. This gives you additional 5 GB of hard drive space to save you documents.

Note that you cannot edit the files outside the chronos home folder. Only the 6.2 GB File System, and C-OEM partition, which has 13.5 MB of free space available, can be accessed by Ubuntu, rest of the partitions (two C-ROOT partitions) cannnot be accessed within Ubuntu.

Issues

If you have any issues on getting additional storage space, feel free to leave a comment.

Selectively Include jQuery Plugins

Introduction

I’m often using jQuery and a little PHP because of the recent interest in the jQuery animation. Therefore I need lots of jQuery plugins to load in every web page. I need some plugins on each page such as Color plugin for the navigation and IE font-face ClearType fix for adding font-face support to IE, but I don’t need other plugins to load unless there is a page element specifically used with those plugins.

The Code

 // Function to create script element dynamically
function createScript(src) {
 var script = document.createElement("script");
 script.src = "scripts/" + src + ".js";
 script.type= "text/javascript";
 $("body").append(script);
}
$(window).load(function() {
  // Load the custom fonts in IE
 $("body").ieffembedfix();
  // Top Navigation Menu Animation
 $("#horiNav a").hover(function() {
  if ($(this).attr("id") != "currentPage") {
   $("#currentPage").stop().animate({backgroundColor:"#FFF", color:"#87CEEB"});
   $(this).stop().animate({backgroundColor:"#A7D4F2", color:"#FFF"});
  }
 }, function() {
  if ($(this).attr("id") != "currentPage") {
   $(this).stop().animate({backgroundColor:"#FFF", color:"#87CEEB"});
   $("#currentPage").stop().animate({backgroundColor:"#A7D4F2", color: "#FFF"});
  }
 });
 if ($("#slideshow").length != 0) {
   // Load the Cycle plugin dynamically
  createScript("jquery.cycle.all.latest");
   // Cycle through the slideshow on the home page
  $("#slideshow").cycle({
   fx: "fade",
   timeout:"3000",
   pager:"#SSnav"
  })
   // Stop the slideshow once it is clicked
  .bind("click", function() {
   $(this).cycle("toggle");
  });
 }
});

Explanation

Here I defined a function that creates a script element before the end of body. The function basically used raw Javascript code to create script element and a line of jQuery code to append the new element to the body.

I used $(window).load instead of $(document).ready method to execute the jQuery code after the page is loaded. I then demonstrated the code for the font-face support for IE and the navigation color animation.

In order to selectively include jQuery plugins, check the existence of the element that requires to use those plugins first. I used if statement to check the length of the element. Include the jQuery plugins if the number of the specified element is at least one. Then execute rest of the code within the if statement. The screenshot below shows Firebug that the page has successfully loaded the required plugin.

Loaded required jQuery plugin successfully

Loaded required jQuery plugin successfully

Head over to wcf.robbychen.com to see it in action. Make sure to open Firebug when visiting the site to see which jQuery plugins are loaded. Right now only the homepage and Who We Are page use additional jQuery plugins.

Questions

If you have any question about the above code, feel free to post them in the comments below.

My Touchpad and Keyboard Solutions for Ubuntu on CR-48 (Updated)

Update (09/09/20110): I no longer use CR-48 because of its hardware limitation. The solutions in this post may not be working as Chrome OS kernel is updated frequently. Sorry for the disappointment.

Update (01/05/2010): As Pheonix7117 pointed out in the comment, here is the fix to the Touchpad issue in Ubuntu. Note that you don’t need to do the first step (Downgrade Xorg) and the last step (Broken Packages) if you are running Lucid (Ubuntu 10.04) on the CR-48.

Update (12/26/2010): For those of you never read comments (like me), Pheonix7117 has posted another tip for vertical scrolling using the touchpad. Here is the direct copy of Pheonix7117’s comment:

Here’s a temporary workaround to get *some* amount of scrolling working in the meantime:If you install the package ‘gpointing-device-settings’ it will add a menu entry to System > Preferences called Pointing Devices.
It *should* list a device called “PS/2 Synaptics TouchPad”.
What I did was enable wheel emulation and changed it to button 3 (which I believe is right click) and enabled vertical scroll. I left timeout and inertia default (inertia seems to be 0, timeout is fairly short) and left middle button emulation unchecked. This enables a regular right click when doing a ‘hard’ click in the bottom right corner without lingering, and if you hold the right click you can swipe a finger up or down to scroll. Granted, this isn’t using the touchpad driver at all as this is supposed to be used for regular mice, but it’s a start for getting by for now.

Update (12/21/2010): Pheonix7117 posted a Python script for controlling the xbacklight in the comments section. I only have a little understanding of Python language, but I think it’s a well-written script to control the backlight with the keyboard.

Introduction

Ever since I installed Ubuntu on CR-48, I wondered about how to improve the touchpad speed and keyboard functions. I experimented with the touchpad driver today and noticed that while I can enable the touchpad tab inside the Mouse property with xinput, the options under the touchpad tab doesn’t seem to take any effect. Therefore I have to find  other ways to configure the touchpad. The keyboard configuration was easy since all the functions are available in Ubuntu except for the right click, caps-lock and delete keys.

Touchpad

General setup - Under the general tab in the Mouse Preferences, move the Acceleration and Sensitivity sliders to the max fast and high respectively so that the cursor could move a little fast and reduce the chance to accidentally tap the touchpad while typing.

Left click and right click - The bottom left and bottom right corners of the touchpad recognize by Ubuntu as the left and right buttons, while toward middle of the touchpad doesn’t have any click event.

Middle click (Scrolling wheel) – I usually use the middle click on web pages when I want to open a link in a new tab. It doesn’t have a middle button on the touchpad. However, I can use Ctrl + tap to open a link to a new tab in most of the browsers. As for the most of the applications I use, none of them has middle click event except for games, which cannot run on this notebook because of the hard drive space limit.

Keyboard

The brightness keys – Install the xbacklight package, and assign the following commands to the corresponding keys on the first row of the keyboard through Keyboard Shortcuts window:

xbacklight -dec 10     # Decrease the backlight by 10
xbacklight -inc 10      # Increase the backlight by 10

The volume mute, decrease volume, and increase volume keys - Change the default shortcuts for Volume mute, Volume down, and Volume up in the Keyboard Shortcuts window to the appropriate keys on the top row of the keyboard.

Right click, caps-lock and delete keys - As I stated earlier, I cannot find the functions for these keys since they are not available on the keyboard. However, you can use some remapping programs to remap these keys to the available keys.

Questions

Do you have any other touchpad and keyboard related tips for CR-48? Please share them below. Also leave a comment below if you have any questions for this topic.

Reinstall Ubuntu on CR-48 notebook with USB

Introduction

According to the /etc/X11/xorg.conf in the Chrome OS, the USB devices need to be manually mounted (AutoAddDevices=’false’). I inserted a sample USB device and run lsusb command to see if detected. It detected successfully without any problem. I then copied the image file with 5GB of size onto the USB drive with a little bit of issue. Using only steps from one small section on the official Chromium OS page, I was able to successfully reinstall Ubuntu on the Chrome OS in about 45 minutes (and downgraded to 10.04 since WebDAV support is broken in 10.10). Here are the detailed steps:

Steps

  1. You need an empty USB thumb drive. The file we are going to copy to the USB drive is more than a little 5GB. The file system for the most flash drives is vfat (FAT file system). It has a single file size limit of about 3GB which our file would fail to copy to the disk.  To solve this issue, you need to reformat your flash drive to the file system format other than FAT using the Disk Utility from System -> Administration menu.

    Disk Utility

    I formated my USB drive as EXT4

  2. Copy rootfs.bin you converted from VDI image to the USB drive.
  3. After it’s finished, insert the drive into the USB slot of CR-48.
  4. Boot into Chrome OS, press Ctrl + Alt + => to switch to develop mode, and login as chronos.
  5. Type sudo su to login to root and type the following line to get the information on where the USB drive is located:
    dmesg | grep sd
  6. /dev/sdb1

    My device is located at /dev/sd1

    My USB drive is located at /dev/sdb1, so I type the following to the command line (replace sdb1 with yours):

    mkdir /tmp/usb
    mount /dev/sdb1 /tmp/usb
    
  7. After it’s mounted, copy rootfs.bin to sda7 with dd command:
    cd /tmp/usb
    cat rootfs.bin | dd of=/dev/sda7
    

    This should take about 20 minutes.

  8. Mount sda7 after that and copy the necessary files to the disk:
    mkdir /tmp/urfs
    mount /dev/sda7 /tmp/urfs
    cd /tmp/urfs
    cp /usr/bin/cgpt usr/bin/cgpt
    chmod a+rx usr/bin/cgpt
    cd /lib/modules
    cp -ar * /tmp/urfs/lib/modules/
    
  9. And finally, don’t forget to unmount the disk:
    umount /tmp/urfs
    umount /tmp/usb
    
  10. There you have it, a brand new Ubuntu installation. You can use the following command to boot into Ubuntu or use the aliases from my last post:
    cgpt add -i 6 -P 5 -S 1 /dev/sda
    

Have issues?

Do you have any issues with any of the steps above? Please feel free to discuss them below.

Reinstall Ubuntu on CR-48 notebook with USB

Install Ubuntu to Chrome OS notebooks with a USB Drive

Introduction

According to the /etc/X11/xorg.conf in the Chrome OS, the USB devices need to be manually mounted (AutoAddDevices=’false’). I inserted a sample USB device and run lsusb command to see if detected. It detected successfully without any problem. I then copied the image file with 5GB of size onto the USB drive with a little bit of issue. Using only steps from one small section on the official Chromium OS page, I was able to successfully reinstall Ubuntu on the Chrome OS in about 45 minutes (and downgraded to 10.04 since WebDAV support is broken in 10.10). Here are the detailed steps:

Steps

  1. You need an empty USB thumb drive. The file we are going to copy to the USB drive is more than a little 5GB. The file system for the most flash drives is vfat (FAT file system). It has a single file size limit of about 3GB which our file would fail to copy to the disk. To solve this issue, you need to reformat your flash drive to the file system format other than FAT using the Disk Utility from System -> Administration menu.
  2. Copy rootfs.bin you converted from VDI image to the USB drive.
  3. After it’s finished, insert the drive into the USB slot of CR-48.
  4. Boot into Chrome OS, press Ctrl + Alt + => to switch to develop mode, and login as chronos.
  5. Type sudo su to login to root and type the following line to get the information on where the USB drive is located:
    dmesg | grep sd
  6. My USB drive is located at /dev/sdb1, so I type the following to the command line (replace sdb1 with yours):
    mkdir /tmp/usb
    mount /dev/sdb1 /tmp/usb
    
  7. After it’s mounted, copy rootfs.bin to sda7 with dd command:
    cd /tmp/usb
    cat rootfs.bin | dd of=/dev/sda7
    

    This should take about 20 minutes.

  8. Mount sda7 after that and copy the necessary files to the disk:
    mkdir /tmp/urfs
    mount /dev/sda7 /tmp/urfs
    cd /tmp/urfs
    cp /usr/bin/cgpt usr/bin/cgpt
    chmod a+rx usr/bin/cgpt
    cd /lib/modules
    cp -ar * /tmp/urfs/lib/modules/
    
  9. And finally, don’t forget to unmount the disk:
    umount /tmp/urfs
    umount /tmp/usb
    
  10. There you have it, a brand new Ubuntu installation. You can use the following command to boot into Ubuntu or use the aliases from my last post:
    cgpt add -i 6 -P 5 -S 1 /dev/sda
    

Have issues?

Do you have any issues with any of the steps above? Please feel free to discuss them below.

My First Tip on using Ubuntu with Chrome OS on CR-48 Notebook (Updated)

Update (03/15/2010): Based on Dan’s comment below, I’ve updated chromeos and ubuntu aliases in the post to remove the Chrome OS partition part. According to Dan, my previous aliases raised Chrome OS partition whenever the OS was switched, which means that when Chrome OS is updated, these aliases would restore the Chrome OS to the oldest version. For more information about this update, please read Dan’s comment.

Update (12/19/2010): I wrote a post on how to use your flash/USB drive to (re)install Ubuntu on the CR-48. Check it out.

Update (12/18/2010): I just discovered that .bashrc file is never executed in Chrome OS unless running another bash after chronos is logged in, and .profile is the file which being executed after each login. Therefore I changed the following instruction to .profile for Chrome OS. If you already created .bashrc file in the chronos home folder, you just have to rename it to .profile using the command below:

mv .bashrc .profile

Introduction

I have used the newly received CR-48 from Google for two days. I enjoyed so far for web browsing, but not so for web development / programming. Since I couldn’t find any good IDE on the cloud which has support for WebDAV, I decided to following the instruction on the Chromium Project website to install Ubuntu onto this device. After several hours of installation, Ubuntu loaded to the device. However, because it comes from a VirtualBox disk image, it’s nearly impossible to reinstall Ubuntu without re-transferring the disk image from my laptop to this notebook which is a 5GB file, it would spend another 5 hours just for transferring this file over ssh. I’m trying to shorten this long waiting hours. I will post another tip if I find a way. But for now, here are the two scripts I wrote to switch between Ubuntu and Chrome OS using the alias command.

Steps

First of all, I assume you also received a CR-48 notebook and installed Ubuntu on it by following on this page.

This first script is for Ubuntu:

  1. Open the file named .bashrc in the home folder  using your favorite text editor (make sure to show the hidden files by pressing Ctrl+H).
  2. Add the following line to the end of the file:
    alias chromeos='sudo cgpt add -i 6 -P 0 -S 0 /dev/sda;echo "Switched to Chrome OS, restart the machine to take effect"'
    
  3. Open a new terminal window to load the new alias.
  4. Type chromeos and a message will be displayed stating that you need to restart to switch to Chrome OS
  5. Restart your device and you are in the Chrome OS.

Now inside the Chrome OS:

  1. Press Ctrl + Alt + -> (the Forward button in the first row) and login as chronos
  2. Since Chrome OS also uses bash, we can write to the .profile file, but this time in the chronos home folder.
    qemacs .profile
    

    The command above creates and opens a new file called .profile inside the home folder using the only text editor available in Chrome OS qemacs.

  3. Insert the following line into .profile
    alias ubuntu='sudo cgpt add -i 6 -P 5 -S 1 /dev/sda;echo "Switched to Ubuntu, restart the machine to take effect"'
    
  4. Execute bash to launch another instance of bash, or if you are confused, you could just logoff current session by typing exit command and login again.
  5. Typing ubuntu command to switch to Ubuntu on the next startup.
  6. Restart your device to begin using Ubuntu.

In the future, you could just use chromeos and ubuntu commands to switch back and forth between Chrome OS and Ubuntu without changing back to normal mode using the small switch on the back of the battery.

Enjoy the free dual-boot notebook from Google.