It seems that the graphic card was too hot. I just changed the cool air flow and the bug disappeared.
** Changed in: xorg (Ubuntu) Status: New => Invalid -- firefox crashes (sometimes X too) https://bugs.launchpad.net/bugs/379691 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs