Precise Pangolin Ubuntu 12.04 Release Notes
Cant find the release notes?
I think they are now called “TechnicalOverview” :-)
Get Ubuntu 12.04
Upgrading from Ubuntu 11.10
To upgrade from Ubuntu 11.10 on a desktop system, 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 ‘12.04’ is available. Click Upgrade and follow the on-screen instructions.
To upgrade from Ubuntu 11.10 on a server system: install the update-manager-core package if it is not already installed; launch the upgrade tool with the command sudo do-release-upgrade -d; and 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 e.g. dropped connection problems.
Upgrading from Ubuntu 10.04
There are some known issues at this time, so only developers and testers should try doing this upgrade at the moment. (927993)