When I first upgraded to breezy I was mildly annoyed that the nvidia drivers broke, I had to install nvidia-legacy instead, and that all of the openGL stuff stopped working although the driver appeared to be loading and xorg seems to think everything is in order. Programs like glxgears would tell me I didn't have GLX. Programs like mplayer would work with "-vo xv" which was good enough most of the time so I didn't worry about it too much. Just recently I thought I would try to sort this out properly. I removed all of the 'restricted' modules and glx stuff, including config, via synaptic, then cleanly reinstalled the nvidia-legacy kernel modules and nvidia-glx-legacy package. Now glxgears exits with a segfault. Worse, so does mplayer even when I use -vo xv and even if I'm trying to play some audio-only file (or even no file at all!) Where to I even begin trying to find out what's messed up and how to fix it?!