Ubuntu 14.04 seems to have failed to upgrade from 12.04
19755
Ubuntu 14.04 doesn' t boot after upgrade from 12.04 installed inside Windows 8.1
119169
Should I upgrade to 14.04 LTS?
144172
How to upgrade to a point release from the same base release (12.04 to 12.04.03)
61473
Failed to fetch because of size mismatch error while upgrading
129101
Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you
63176
How can I update to Ubuntu 21.04?
56225
Do I have to download both the 14.04 and the 14.04.1 versions of ubuntu?
132495
14.04.5 to 16.04 Update failed - xenial.tar.gz.gpg missing
112955
How can I upgrade Ubuntu from 19.10 to 20.04 without losing packages?
967
How can I avoid "please insert CD/DVD" error when updating Ubuntu?
15687
How do I resume a release upgrade?
1520
How to install software or upgrade from an old unsupported release?
83107
12.04 continuously offering partial upgrade
5820
How to fix the “Unable to calculate upgrade” issue from command line when upgrading from 12.04 to 14.04?
36986
Ubuntu kernel not upgrading with upgrade to 15.10
105335
How do I upgrade my Ubuntu server from one LTS version to another? Is this safe?
100494
Update Manager asking me to update kernel but apt-get upgrade does not?