3

I am stuck at grub rescue. I tried booting Ubuntu from a live USB, then doing this

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

the this error came up.

Please check that the PPA name or format is correct.
1

You are using the wrong command(s) - the correct ones are :

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install -y boot-repair && boot-repair  

Reference

Note : When you really deleted the Ubuntu system partition, you better should reinstall Ubuntu.

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