I was following an old tutorial and did an apt-get installed a repository (I think that's what it was) I am no ubuntu guru. Turns out that repo no longer exists, and when I now do an apt-get update I ...
I tried installing a theme using the following lines:
sudo add-apt-repository ppa:noobslab/themes
sudo apt-get update
sudo apt-get install vimix-flat-themes
Needless to say the theme did not install ...
So you want to try an app that is in a PPA, so you add the PPA like so:
sudo add-apt-repository [some PPA]
Then you decided you don't like it or it's buggy or whatnot.
What is the command to remove ...