Could not add ppa:neon/kf5 (ubuntu 14.04)
22624
Unable to locate package kubuntu-plasma5-desktop on 14.04
1833
14.04 Cleanly upgrade to ppa:ondrej/php from ppa:ondrej/php5-5.6
121470
How to install 'add-apt-repository' using the terminal?
32220
How to resolve Unmet dependencies error?
48418
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available:
6809
How do I fix the GPG error "NO_PUBKEY"?
44209
Problem with update-manager: No module named 'apt_pkg' in Ubuntu 13.10, having installed Python 3.4 on /usr/local/lib
66605
Installing Unity alongside KDE
28695
Is there a way to install Unity or Gnome Shell along with Lubuntu?
32426
How to install packages?
29395
How do I get a vanilla GNOME after Ubuntu 17.04?
36332
Can a deb package contain a PPA dependency and install packages from the PPA?
111573
What's the best way to re-enable PPAs/repos after an upgrade?
151066
Failed to fetch PPA Error (Deluge)
40335
Unity / Compiz problem after update from Xorg ppa
54350
Error running : apt-get install ttf-mscorefonts-installer
36696
Unmet dependencies unable to fix