Upgrade from 15.10 to 16.04 - "no new release found"
1520
How to install software or upgrade from an old unsupported release?
100494
Update Manager asking me to update kernel but apt-get upgrade does not?
142310
Ubuntu 12.04 software upgrade does not show 12.10 upgrade
121201
Why can't I update applications without upgrading the whole OS?
9322
Software Updater Issue 16.04
30754
Cannot update: "No available releases found"
56282
16.04 LTS upgrade alert- How to handle it?
20398
dpkg broken after 15.04 upgrade fail
94171
Why Does Software Updater Say No updates Available, but apt-get upgrade Shows updates available?
102559
How to install package from newer distribution?
42346
Why does Ubuntu release version at x.04 and x.10?
51350
While updating the ubuntu 16.04 does not have a Release file Error
101714
Is there any way to roll back the most recent upgrade?
64558
What does `do-release-upgrade` really do?
72152
Upgrading 16.04 to 16.04.1
77692
How do I update Drush to the latest available version?
148808
Update from Mac OS X 10.6.8 to the newest version