Stellarium 0.11.1 is now available via a Launchpad PPA (Personal Package Archive) for all five currently supported versions of Ubuntu: from 10.04 LTS Lucid Lynx to the still-in-development 12.04 LTS Precise Pangolin.
Stellarium's Ubuntu Releases PPA can be found at Launchpad:
To get the updated Stellarium packages, you need to add the following line to your system's Software Sources:
This can be done either in the Software Center, the Synaptic package manager or the command line. After that, install or update Stellarium as you do normally.
To add the repository via the command line, open a terminal and run the following commands:
sudo add-apt-repository ppa:stellarium/stellarium-releases
sudo apt-get update