I think I now verified the last assumption. I copied a file that has been created very early on the FS (in this case "menu.lst"), and moved it to "default", overwriting the problematic file. Then I recreated "menu.lst" using cp from "default", and sanitized "default" grub-set- default. Now the boot process works fine again.
-- Regression: grub - Error 18 when using savedefault (feisty/edgy) https://bugs.launchpad.net/bugs/79578 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs