This bug may have been a hardware problem. I used to have frequent lockups in my computer, then I disabled AGP 4x (limit to 2x) in the BIOS and since then (a couple of weeks ago) I never again had any kind of kernel problem.
So feel free to close if you want. -- kernel oops reading from pipe https://launchpad.net/bugs/69040 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs