Upgrade from 14.04 to 16.04 Preview
42634
How do I upgrade to the development release (aka. Ubuntu+1)?
112955
How can I upgrade Ubuntu from 19.10 to 20.04 without losing packages?
132495
14.04.5 to 16.04 Update failed - xenial.tar.gz.gpg missing
63278
Update Linux Subsystem on Windows (Ubuntu) to 16.04
21323
Where can I download the latest release of Ubuntu?
144172
How to upgrade to a point release from the same base release (12.04 to 12.04.03)
24165
Upgrade to version newer than repositories
19288
Update manager doesn't offer an upgrade to the new release
102627
Can the Windows 8.1 Preview be upgraded to the final release?
4309
How can I download an older version of OS X/macOS?
36703
How do I upgrade from 12.10 to 13.04?
103445
Will painless upgrading from Drupal 8 alpha 3.x to beta be possible?
56537
How to prevent Windows 10 Tech Preview from upgrading itself to a new test build?
140371
Update Ubuntu 10.04
75798
How to upgrade to the latest GNOME version?
114305
On really old Ubuntu 6.06 - How to upgrade
35093
Upgrading from the command line?