Cannot add PPA: 'ppa:yannubuntu/boot-repair'

This specific issue occurs when you live boot and try to do add the ppa before being connected to the internet.

Simply connect to the internet first and then try to add the ppa again just like before.

I would suggest you to do in terminal:

sudo add-apt-repository ppa:yannubuntu/boot-repair

and then do:

 sudo apt-get update

if it doesn't work I would suggest you to add it manually in apt-get

nano /etc/apt/source.list.d/yannubuntu-boot-repair-saucy.list

and write this:

deb http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu saucy main

then save it and update:

sudo apt-get update

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