Install The Ubuntu Touch On Your Android Device

INSTALL THE UBUNTU TOUCH PREVIEW ON YOUR NEXUS ANDROID DEVICE

Warning Please take backup your rom on android device

You can install the preview release of Ubuntu Touch on a Nexus device (the Galaxy Nexus, Nexus 4, Nexus 7, or Nexus 10).


PREPARE UBUNTU ON THE DESKTOP

We will be using Ubuntu O/S on a PC to install Ubuntu Touch on android deivce. If you don’t have Ubuntu installed, you should be able to boot from an Ubuntu live CD and perform this process from the live Ubuntu environment without even installing Ubuntu on your computer.
To install the required software, open a terminal and run the following commands on your 

Ubuntu O/S

sudo add-apt-repository ppa:phablet-team/tools
sudo apt-get update
sudo apt-get install phablet-tools android-tools-adb android-tools-fastboot




UNLOCK YOUR DEVICE
To install another operating system on your Android Device, you will need to unlock its boot loader. If you have already unlocked the boot loader to install a custom ROM or root your device, you can skip this section.

How To unlock the Android Device
Power Tuneoff 
Pressing the Power Button
 Press Volume Up and Volume Down buttons in same time. It will boot like this.




Connect the Android device to your computer with a USB cable, open a terminal, and run the following command:
   sudo fastboot oem unlock

Confirm that you want to unlock your device, then press the Power button to boot the device. Go through the typical Android setup process until you reach the home screen.

DEVICE PREPARATION

Now you will need to enable USB debugging on Android device. The instructions here assume your device is running Android 4.2.

open the Settings

select About phone or About tablet.

On the About screen, tap the Build number field seven times.

You’ll see the message “Congratulations, you are now a developer” appear on the screen.

Return to the main Settings screen and select the now-visible Developer option. Enable the USB debugging option on the Developer Options screen.

Next, run the following commands on your computer:

adb kill-server

adb start-server

Connect the Android device to your computer and you should see a confirmation pop-up on your device. Agree to the message.

On the About Phone or About Tablet screen, locate the build number you tapped earlier and write it down. 

You’ll need this number when you reinstall Android later.

INSTALL UBUNTU TOUCH

If you’ve followed the instructions above, you should be able to install Ubuntu Touch by running the following command:

phablet-flash -b

This command will erase everything on your Android device, download the latest image of Ubuntu Touch, and install it on your device. After everything is done, your device will automatically reboot into the Ubuntu Touch environment. Be patient while the process completes.