Upgrading from Ubuntu 12.04 LTS
To upgrade from Ubuntu 12.04 LTS on a desktop system:
Open Software Sources.
Switch to the Updates tab and set Notify me of a new Ubuntu version to For any new version.
Press Alt+F2 and type in
update-manager -d (without the quotes) into the command box.
Update Manager should open up and tell you:
New distribution release '12.10' is available.
Click Upgrade and follow the on-screen instructions.
To upgrade from Ubuntu 12.04 LTS on a server system:
update-manager-core package if it is not already installed.
Launch the upgrade tool with the command
sudo do-release-upgrade -d.
Follow the on-screen instructions.