Upgrading from Ubuntu 13.10 to 15.04
1520
How to install software or upgrade from an old unsupported release?
58979
How can I upgrade Ubuntu LTS to the next one offline?
89856
How to resume the interrupted upgrade from 14.10 to 15.04?
114492
How can I upgrade from Mac OS X Tiger 10.4?
128471
How do I update from 9.0.10 to 9.1.0?
126659
upgrade from 11.10 to 12.04 - No upgrade option available in update manager
21323
Where can I download the latest release of Ubuntu?
31506
How do I update Ubuntu manually?
56225
Do I have to download both the 14.04 and the 14.04.1 versions of ubuntu?
129589
Migrating from Windows XP to Ubuntu
75798
How to upgrade to the latest GNOME version?
66915
How to request a package upgrade in the next Ubuntu release
11556
Can I smoothly upgrade from one LTS to next LTS release?
107548
Where can I download Ubuntu 16.04?
113056
How to upgrade from 12.04 to 12.10 using CD?
144507
No facility exists in Update Manager to upgrade to a new version, why?
115421
Ubuntu 13.10 to 14.04 Lts does not upgrade, keeps showing error