Unable to upgrade from 11.10 to 12.04?

Question

I cannot find reference to the new release (12.04) in the update manager (it was there, now no longer), while

mark@Athene:~$ sudo do-release-upgrade
Checking for a new ubuntu release
No new release found

although I am running 11.10.

Answer 1

1. Check your system with cat /etc/issue. Is it really 11.10?
2. Use Update Manager: update-manager -d.

Answer 2

Try in terminal:

sudo apt-get update and then : sudo apt-get upgrade

Answer 3

Enter the Update Manager , select Settings and in the Updates make sure to select Notify me of a new Ubuntu version: For any new version.

Answer 4

This should work

open terminal by pressing Ctrl+Alt+T

type:

sudo do-upgrade-release -d