How to upgrade from 11.10 to 12.04?
7580
How to safely upgrade from an older Ubuntu version to a newer one?
129101
Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you
128471
How do I update from 9.0.10 to 9.1.0?
211
Can I skip over releases when upgrading?
97346
Is it possible to skip releases during an upgrade?
72296
Upgrading Ubuntu from 12.04 to 12.10 broke my system, completely.
43778
Is it possible to "upgrade" from a 32bit to a 64bit installation?
63176
How can I update to Ubuntu 21.04?
35146
Will apt-get dist-upgrade upgrade my system to newer version?
12578
How do I upgrade to a newer version of Ubuntu?
4309
How can I download an older version of OS X/macOS?
121201
Why can't I update applications without upgrading the whole OS?
60659
Install newer package version from trusty-backports
31506
How do I update Ubuntu manually?
80709
Install 12.04 on top of existing Linux Mint installation
1520
How to install software or upgrade from an old unsupported release?
126659
upgrade from 11.10 to 12.04 - No upgrade option available in update manager