I had exactly this problem with Edgy during the last approx 5 days, and the solution of editing line 3 of /etc/udev/rules.d/45-libgphoto2.rules did the trick.
-- Error in libgphoto2 udev rules https://launchpad.net/bugs/91250 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
