Where did the disco repos go, or what is going on?
1520
How to install software or upgrade from an old unsupported release?
3946
Has 'Ubuntu Software' been renamed to 'Snap Store'?
133
How can I fix a 404 Error when using a PPA or updating my package lists?
116858
How to find the list of all available packages along with the lastest version number available in the repositories?
45993
How to keep up with packages and know which ones are obsolete?
19087
How do I recreate a deleted '/var/lib/dpkg' directory?
79163
Sources missing in /etc/apt/sources.list, how do I get them back?
41519
What can I do if a package is not available on the newest version of Ubuntu (18.04) but is available on older versions?
65612
How to delete/remove manually apt added repositories?
28176
How do I recover from accidentally removing dpkg?
30645
How to install (old) packages for Ubuntu 9.04?
47808
"The following packages were automatically installed and are no longer required:" what to do?
113026
What happened to /etc/apt/apt.conf?
135393
Why does Ubuntu Software Center not show every package available?
143747
How do I enable the "backports" repository?
35987
No updates since a long time
7548
Has drupal abandoned drush?