How to safely upgrade from an older Ubuntu version to a newer one?
12578
How do I upgrade to a newer version of Ubuntu?
43778
Is it possible to "upgrade" from a 32bit to a 64bit installation?
72152
Upgrading 16.04 to 16.04.1
133002
Can I install two Ubuntu versions on the same machine?
77705
Unable to upgrade in ubuntu
112536
Upgrading Ubuntu chroot environment?
127766
how to upgrade my Debian package with minor changes
66915
How to request a package upgrade in the next Ubuntu release
211
Can I skip over releases when upgrading?
4660
Should I be offered the option to upgrade to 18.04.1?
128471
How do I update from 9.0.10 to 9.1.0?
117112
Why isn't Ubuntu moving its repositories to old-releases anymore?
15687
How do I resume a release upgrade?
19395
How can I install more recent versions of software than what Debian provides?
113056
How to upgrade from 12.04 to 12.10 using CD?
125976
What Happens When I Upgrade Ubuntu?
95336
Installing particular versions when repo has newer versions?