So I've been having some graphics problems, and recently I installed these packages: http://www.ubuntugeek.com/how-to-install-intel-82852855gm-drivers-in-ubuntu-using-ppa.html But after installing those and restarting my computer, I cannot get Ubuntu to load--it freezes on the purple screen. In recovery mode, I have tried to use root to fix some things, but it hasn't work, and I cannot connect to the internet in recovery mode to download anything else.
Is there any way I can uninstall these packages in recovery mode to revert back to what I had before?