Upgrade from ubuntu 14.04 to 15.10
12578
How do I upgrade to a newer version of Ubuntu?
112955
How can I upgrade Ubuntu from 19.10 to 20.04 without losing packages?
66915
How to request a package upgrade in the next Ubuntu release
43778
Is it possible to "upgrade" from a 32bit to a 64bit installation?
35093
Upgrading from the command line?
144507
No facility exists in Update Manager to upgrade to a new version, why?
36703
How do I upgrade from 12.10 to 13.04?
68597
Will upgrading Ubuntu remove installed software?
50348
Upgrade from EF-S 15-85 IS
14631
Can someone clarify Ubuntu (Debian) dist-upgrade for me?
129223
Ubuntu upgrade from 17.04 to 18.04
114167
install vagrant version 1.5 or greater on 14.10
25919
How to replace an old version of Ubuntu with a newer one from USB/DVD?
135547
Downgrading from OS X 10.9.2 to 10.9
151605
upgrading from 15.10 to 16.04 apt not installed
11556
Can I smoothly upgrade from one LTS to next LTS release?
7580
How to safely upgrade from an older Ubuntu version to a newer one?