Hoping to fix a few issues with KDE apps on Kubuntu 16.04, I added a backports PPA (
kubuntu-ppa-ubuntu-backports-xenial), and updated manually a couple of apps (apt-get install --only-upgrade`).
- made very extensive changes to the system (many packages added/removed)
- created more problems than it solved (my fault?)
Furthermore it is about time I apply a bunch of regular upgrades, and I'm not confident enough to allow a general upgrade from the PPA.
- how can I remove the PPA with minimal damage? (What happens to the already installed software?)
- Is there any chance that the problems come from either not upgrading my system before adding the PPA (no upgrades in the last two months) or because I used the wrong option to upgrade?