I've had a look at startupmanager, and don't see anything in there that would have created a /boot/grub/default of this sort. If you also didn't create it by hand, I don't know how this file came to be. I would suggest resetting it with 'grub-set-default 0' to work around the problem you're having.
Still, 'grub-set-default default' is part of the documented interface for this command, so update-grub should be able to handle this case. Confirming this bug. ** Changed in: grub (Ubuntu) Importance: Undecided => Low Status: New => Confirmed -- update-grub fails when default is "saved" https://bugs.launchpad.net/bugs/193439 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