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:
Ensure that /etc/update-manager/release-upgrades includes Prompt=Normal.
Install the 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.


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