getting 404 error trying to upgrade outdated 19.10 to 20.10
1520
How to install software or upgrade from an old unsupported release?
11909
404 error with apt-get update, Don't have any PPA's
107792
Update information outdated, "Failed to fetch cdrom"
110148
Why does `do-release-upgrade` skip a version?
42634
How do I upgrade to the development release (aka. Ubuntu+1)?
146675
Error 101: Network is unreachable when trying to update
9901
How to upgrade from 18.10 to 19.10, using the command line?
30754
Cannot update: "No available releases found"
48809
"The upgrade has aborted" error, how to proceed?
77692
How do I update Drush to the latest available version?
43917
What is the difference between apt-get update and upgrade?
63176
How can I update to Ubuntu 21.04?
50810
No upgrade available for 19.04 from 18.10
142807
Can't update RVM - "fatal: Unable to find remote helper for 'http'"
133336
How do I update jQuery to the latest version I can download?
126659
upgrade from 11.10 to 12.04 - No upgrade option available in update manager
121201
Why can't I update applications without upgrading the whole OS?