All you have to do is to download and install it.
Step 2: Installing a Terminal
Youll need a terminal emulator for using your Linux OS.
Step 4: Youre almost ready
Go back to the Terminal app and write su again.
Then write cd /mnt/sdcard.
To start our ubuntu write cd /ubuntu and then sh ubuntu.sh.
This will execute many procedures which are trying to set your system.
It will request to enter a resolution.
Use number x number format to express it.
For example: 600400 is the proper format.
For the best appearance and performance I suggest 800480.
Now everything is done.
The ubuntu system is running , however we cant see it.
To see it , we must use a VNC app.
We can download it fromPlay Store.
source: www.techworm.net