Bug #49810 is likely the same as this bug.
It is the Gnome Desktop that crashes. This was found in Dapper Current which was upgraded from Breezy, but I've been running Dapper since release date.
Some more info:
ASUS A7N8X-D Motherboard
NVIDIA 6200 video card
If I could get some instruction on debugging python, I may be able to tell at which point update-manager crashes the desktop.