upgrading from ubuntu 12.04 to 14.04
8699
Getting "System program problem detected" pops up regularly after upgrade
126659
upgrade from 11.10 to 12.04 - No upgrade option available in update manager
111573
What's the best way to re-enable PPAs/repos after an upgrade?
13970
Why am I not getting the Ubuntu 18.04 upgrade?
115421
Ubuntu 13.10 to 14.04 Lts does not upgrade, keeps showing error
113056
How to upgrade from 12.04 to 12.10 using CD?
43778
Is it possible to "upgrade" from a 32bit to a 64bit installation?
24165
Upgrade to version newer than repositories
66915
How to request a package upgrade in the next Ubuntu release
75798
How to upgrade to the latest GNOME version?
35146
Will apt-get dist-upgrade upgrade my system to newer version?
144507
No facility exists in Update Manager to upgrade to a new version, why?
67359
Upgrade to the latest PHP version in Ubuntu
119595
Is it necessary to upgrade to 14.04 LTS or can I stand in 12.04 LTS forever with no problem?
60659
Install newer package version from trusty-backports
63176
How can I update to Ubuntu 21.04?
421
How do I update a Drupal distribution to a newer version?