I have a similar problem : my 'default' file exists but when the 'savedefault' part is present I have the 'Error 25...' message.
I'm on Dapper, all packages updated on June, 14. -- Fails to boot when /boot/grub/default is not found https://launchpad.net/bugs/44435 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
