Upgrading Natty -> Oneric went fairly well. I was trying out the Gnome + Cairo thing but was slightly annoyed by some intermittent flickering in Cairo. I wanted to try without the ATI driver and removed it using the Hardware drivers-tool. My machine has an Intel/Radeon GPU combo so I actually have three choices of drivers.
No OpenGL-support when booting. I found a clue to the problem, switching to console and running glxgears (I know it wouldn't work, but read on) which complained about not finding libGL.so.1.
I kept nosing around, looking at the update-alternatives-command, ld.so.conf files and so on. I can't seem to find the problem! The only way I get a desktop with 3D support now is by having fglrx installed.
Can someone assist me in fixing the mesa-opengl support?
Trying to install libgl1-mesa-glx or libgl1-mesa-dri I get this:
I might have found the issue in this bug report.E: Internal Error, No file name for libgl1-mesa-glx
Through the posts in the bug report I managed to get libgl1-mesa-glx and -dri reinstalled, but the problem remains. If I remove fgrlx I can't get 3D support from mesa.
Solved. Seems these two finally did the trick:
sudo apt-get remove --purge fglrx*sudo apt-get install --reinstall libgl1-mesa-glx:amd64 libgl1-mesa-glx:i386 libgl1-mesa-dri:amd64 libgl1-mesa-dri:i386