I just finished an update on 6.04, and X broke. I tried re-running
nvidia installer, but no luck.

X kept failing saying it couldn't find module nvidia.

I finally figured out the problem. Running the following two commands
fixed the problem:

cp /usr/X11R6/lib/modules/drivers/nvidia_drv.so \
/usr/lib/xorg/modules/drivers
cp /usr/X11R6/lib/modules/extensions/libglx* \
/usr/lib/xorg/modules/drivers


I suppose if one is using xorg, this may have to be done every time the
nvidia drivers are updated.

~S