Do you have any active PPA that might affect normal updates? (ie Ubuntu-X team or xorg edgers, etc) – Bruno Pereira♦Feb 5 '12 at 21:59
No... and it was working fine until a couple of days ago. I attributed it, perhaps wrongly, to the latest updates. I am running 10.10. – DonnaFeb 5 '12 at 22:01