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GRUB

Ref: Ubuntu Grub2

Show GRUB when boot​

Hold Shift when boot

Update GRUB config​

Find all OS, update GRUB config, install GRUB to MBR / UEFI

update-grub

GRUB auto-generate config file​

/boot/grub/grub.cfg

GRUB option file​

/etc/default/grub

Set GRUB default to last selected option​

# /etc/default/grub
GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true