I haven't been able to upgrade from 19.10 to 20.04 or because of apt-get release problems. Now I am told that 19.10 is no longer supported
728
Unable to lock the administration directory (/var/lib/dpkg/) is another process using it?
102559
How to install package from newer distribution?
135575
How to fix a "Failed to fetch binary-armhf/Packages" error during apt-get update?
128471
How do I update from 9.0.10 to 9.1.0?
103929
sudo apt upgrade error 18.04 (Broken Packages)
100494
Update Manager asking me to update kernel but apt-get upgrade does not?
98421
How will people upgrade from 12.10 to later releases after 13.04 is EOL?
13399
Why can I no longer (un)install packages via apt-get after doing a partial dist-upgrade?
63176
How can I update to Ubuntu 21.04?
91491
How can I get "delta" packages to optimize apt-get upgrade downloads?
1632
How do I fix a "Failed to download package files" error?
11909
404 error with apt-get update, Don't have any PPA's
93942
How to fix "Failed to download repository information" error while updating?
56150
Can't upgrade/update ubuntu 18.04 as apt/dpkg error is showing up
57534
The difference between the different APT upgrade commands
51598
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
65099
Unable to install any updates through update manager/apt-get upgrade