참조: Upgrading from Ubuntu 11.04

To upgrade from Ubuntu 11.04 on a desktop system,
press ALT+F2 and type in

$ update-manager -d

into the command box. Update Manager should open up and display following message:
“New distribution release ’11.10′ is available.
Click Upgrade and follow the on-screen instructions”.

To upgrade from Ubuntu 11.04 on a server system,
follow the steps listed below:

Step 1: Install the “update-manager-core” package (if it is not already installed).
Step 2: Use following command to launch the upgrade tool.
$ sudo do-release-upgrade -d

Step 3: Follow the on-screen instructions. Note that the server upgrade is now
more robust and will utilize GNU screen and automatically re-attach
in case of dropped problems, for example.