Comment 10 for bug 747717

The problem occurs for me too, on a Sun Ultra 20 M2 with NVIDIA Quadro NVS 285 graphics, running Linux x86 (not x86-64). Downgrading to the 173 version did not help.

I worked around the problem by switching to the nouveau driver, and dumping Unity (Unity 2D does not work well at all) in favor of the traditional Gnome desktop. The entire experience was unpleasant enough that on another machine, which uses GeForce 8300, I am sticking with Ubuntu 10.10.