After a file system crash I reinstalled jaunty. I did not change the partitions. I only formatted the root partition with ext4 again. The bug disappeared, Ubuntu boots now without any problems. So I am closing the bug report.
** Changed in: grub (Ubuntu) Status: New => Invalid -- grub does not resolve ext4 uuid https://bugs.launchpad.net/bugs/320860 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs