Download links for Mesa

Install Mesa
CommentPrerequisites: Make sure you are running the latest version of ubuntu, and all your packages are up to date
1) Add the ubuntu x staging ppa (https://launchpad.net/~ubuntu-x-swat/+archive/x-staging)
sudo add-apt-repository ppa:ubuntu-x-swat/x-staging
2) Update apt and install the new mesa version
sudo apt-get update && sudo apt-get dist-upgrade
3) Install mesa-utils if you don't already have it.
sudo apt-get install mesa-utils
4) Restart your computer to load the new version of mesa
Uninstall Mesa
CommentYou may remove the experimental alsa packages by using ppa-purge
1) Install ppa-purge
sudo apt-get install ppa-purge
2) Remove the ppa
sudo ppa-purge ppa:ubuntu-x-swat/x-staging
3) PPA Purge will find the packages installed and offered to downgrade them.
Say yes and ppa-purge will remove the upgraded versions and reinstall the versions from the archive.