How to restore update settings after accidentally changing it with dist-upgrade and pantheon desktop environment
39582
Difference between "ppa-purge" and "add-apt-repository -r"?
19087
How do I recreate a deleted '/var/lib/dpkg' directory?
157307
Where do packages installed/upgraded with APT get stored?
28176
How do I recover from accidentally removing dpkg?
13399
Why can I no longer (un)install packages via apt-get after doing a partial dist-upgrade?
89856
How to resume the interrupted upgrade from 14.10 to 15.04?
53267
How do I recover the default version of some configuration file?
148676
Where is the result of the "apt-get update" package list stored
2136
How to roll back Ubuntu to a previous version?
120
How do I restore the default repositories?
6501
How to reinstall configuration file
106931
How to undo sudo add-apt-repository?
149428
How do I refresh the package list?
113145
What does 'apt-get install update' do?
107352
How can I reload .emacs after changing it?
62279
18.04: How to get Wayland back after upgrade to 18.04?
145917
Removing broken packages on distro update (13.04 to 13.10)