Failed upgrade, bad!
15687
How do I resume a release upgrade?
154622
How do I resolve this installation error?
18765
Installation failed due to an invalid URI
76241
"no public key available" while upgrading using update-manager
134080
Still can't upgrade? Is there a new delay?
93942
How to fix "Failed to download repository information" error while updating?
12578
How do I upgrade to a newer version of Ubuntu?
30754
Cannot update: "No available releases found"
43778
Is it possible to "upgrade" from a 32bit to a 64bit installation?
35243
Is it safe to do-release-upgrade from 12.04.4 to 14.04.1?
109538
Windows Update Error 80072EE2
11166
"Require Installation Of Untrusted Packages" while upgrading with the update manager
4268
How to fix "Package is in a very bad inconsistent state" error?
144507
No facility exists in Update Manager to upgrade to a new version, why?
125976
What Happens When I Upgrade Ubuntu?
74990
Error while trying to upgrade from Ubuntu 18.04 to 18.10: "Please install all available updates for your release before upgrading."
2432
Unable to correct problems, you have held broken packages