Why are out-dated Ubuntus so difficult to upgrade
1520
How to install software or upgrade from an old unsupported release?
56150
Can't upgrade/update ubuntu 18.04 as apt/dpkg error is showing up
74990
Error while trying to upgrade from Ubuntu 18.04 to 18.10: "Please install all available updates for your release before upgrading."
13970
Why am I not getting the Ubuntu 18.04 upgrade?
83074
Why does the separation of update and upgrade even exist?
63514
How do I decide what version of Ubuntu to install?
35973
Ways to update Ubuntu (debian-based distros) offline
119943
Where can I find a repository for older unsupported releases?
101714
Is there any way to roll back the most recent upgrade?
43778
Is it possible to "upgrade" from a 32bit to a 64bit installation?
49161
Upgrade manager wants me to do a partial upgrade
52190
How and when is old-releases.ubuntu.com updated?
105335
How do I upgrade my Ubuntu server from one LTS version to another? Is this safe?
45993
How to keep up with packages and know which ones are obsolete?
144507
No facility exists in Update Manager to upgrade to a new version, why?
129101
Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you
75798
How to upgrade to the latest GNOME version?