2
All you need are 2 commands:
grub-set-default {NUMBER}
update-grub
where {NUMBER} is the one you want to boot into.
Change {NUMBER} to a variable, put these 2 in a script, execute with sudo {file} {number}.
1
You haven't provided specifics as to your box - are you using uEFI, Secure uEFI or BIOS in booting? I'll assume BIOS and walk through a common process I do.
For my own boxes (where I QA-test and install releases many times per week) and often have 1-6 (GNU/Linux but mostly Ubuntu flavors) systems installed on a box, the last installed will always end up ...
Only top voted, non community-wiki answers of a minimum length are eligible
