On Ubuntu, you may add a PPA to get some cutting edge feature and then decide you don’t need that feature anymore. So you may decide to remove the PPA to get the regular version of a library. How do we remove a PPA?
Use the –remove flag, similar to how the PPA was added:
sudo add-apt-repository --remove ppa:whatever/ppa
A safer alternative is to use ppa-purge. Install it with the command:
sudo apt-get install ppa-purge
And then remove the PPA, downgrading gracefully packages it provided to packages provided by official repositories:
sudo ppa-purge