Older solution does not work anymore
65
What can I do if a repository/PPA does not have a Release file?
139431
How to work around "Release file expired" problem on a local mirror
131568
Packages problems on version 9 under OS X
158778
How to re-enable the systray (indicator panel) after latest updates
112267
Can you help me with my software dependency issue?
151800
How do I effectively support old feature requests?
60524
Upgraded to Ubuntu 18.04, but I still have old UI
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?
50092
Commands out of sync; you can't run this command now
73173
How to Fix Broken Packages?
55857
How do I get a list of obsolete packages?
47808
"The following packages were automatically installed and are no longer required:" what to do?
11579
Broken dependencies after upgrade
45993
How to keep up with packages and know which ones are obsolete?
144507
No facility exists in Update Manager to upgrade to a new version, why?
157235
Is the tabu package obsolete?
35190
"Software Updater" & "Software & Updates" not working