Failed upgrade from 12.04 to 13.10
211
Can I skip over releases when upgrading?
55211
Problem when upgrading to Ubuntu 14.04 from Ubuntu 12.04
10023
'Some index files failed to download' while updating
11166
"Require Installation Of Untrusted Packages" while upgrading with the update manager
77158
Mount exited with exit code 13
11579
Broken dependencies after upgrade
80233
Upgrade to 20.04 from 19.10 isn't available
98844
upgrade 14.04 with errors and shows red sign on top
13970
Why am I not getting the Ubuntu 18.04 upgrade?
24603
apt-get upgrade gives "403 forbidden" error
116445
"Can't check signature: public key not found" while upgrading, why?
153774
Upgrade to Ubuntu 13.10 from ISO image
23096
How to remove obsolete packages after failed release upgrade via do-release-upgrade on Ubuntu?
77062
Updates stopped and fix-broken install is broken
129143
Error upgrading to High Sierra
44209
Problem with update-manager: No module named 'apt_pkg' in Ubuntu 13.10, having installed Python 3.4 on /usr/local/lib
127196
"Error processing package" - apt upgrade cannot run due to package configuration errors