Submenu Designation Examples
All of the following examples indicate the first menuentry in the first submenu. Titles are easier to use but numbers are also acceptable for either or both values.
Examples: In the following examples, the main menu consists of the current kernel, a recovery mode option, and the submenu "Previous Linux versions" as the third entry. The desired default is the first entry in the first submenu.
GRUB_DEFAULT="Previous Linux versions>Ubuntu, with Linux 3.2.0-18-generic-pae"
GRUB_DEFAULT="Previous Linux versions>0"
GRUB_DEFAULT="2>0"
GRUB_DEFAULT="2>Ubuntu, with Linux 3.2.0-18-generic-pae"