IT/Software/System Config/grub
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Grand Unified Boot Loader
this is the default in linux.
Runs really well but has never been really intuitive to make changes
BECAUSE you normally should not be messing around in here.
Change the boot order
Boot the last booted
sudo nano /etc/default/grub
Now add the following two lines
GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true