Is any offline upgrade from 13.10 to 14.04 possible?
109539
How can I perform an offline upgrade using Ubiquity on the installation disc?
82510
Will Ubuntu work if I install it offline?
119943
Where can I find a repository for older unsupported releases?
119169
Should I upgrade to 14.04 LTS?
43279
Alternative Method to Acquire El Capitan Upgrade
118978
Not all updates can be installed: partial upgrade
20399
How do I upgrade from 14.04 LTS to 16.04.1 LTS?
42634
How do I upgrade to the development release (aka. Ubuntu+1)?
45553
How do I install the latest stable version of Firefox?
11556
Can I smoothly upgrade from one LTS to next LTS release?
35093
Upgrading from the command line?
1520
How to install software or upgrade from an old unsupported release?
35146
Will apt-get dist-upgrade upgrade my system to newer version?
31506
How do I update Ubuntu manually?
154848
How can I install 'restricted-extras' offline?
38590
How do I suppress the "New release '12.10' available" message?
43778
Is it possible to "upgrade" from a 32bit to a 64bit installation?