To install Ubuntu using Flash drive:
1. Get Ubuntu ISO image from official Ubuntu releases: http://releases.ubuntu.com/
2. Verify the md5 sum (hash) of the ISO image file to check the integrity of the image by following these instructions:
First open a terminal and go to the correct directory (in this case Downloads) to check a downloaded iso file:
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tssfl@tssfl:~$ cd ~/Downloads
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md5sum ubuntu-16.04-desktop-amd64.iso
md5sum should then print out a single line after calculating the hash such as:
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c94d54942a2954cf852884d656224186
https://help.ubuntu.com/community/UbuntuHashes.
The easiest way to compare, is to copy the hash corresponding to that of your ISO image from the website, and paste it in the terminal next to the hash calculated by your machine, if the two hashes match, they will both be highlighted in red color.
Finally, go to https://help.ubuntu.com/community/Insta ... omUSBStick, and create a bootable USB stick by using a Startup Disk Creator in the Unity Dash by typing "Startup Disk Creator". If it is not there, then you can install it using the Synaptic Package Manager or through Ubuntu Software Center or through terminal by sudo apt-get install command.