Grub: Multi Bootable Partitions
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Document how
grub
automatically detects bootable partitions and adds them to grub boot menu.
Open
/etc/default/grub
and append the following code to it.
# Enable detecting other bootable partitions. GRUB_DISABLE_OS_PROBER=false
Run
sudo update-grub
Run
cat /boot/grub/grub.cfg
to confirm that all bootable partitions have been added to the grub menu entry.
Reboot to confirm whether it works.
Further Reading
https://copyprogramming.com/howto/warning-os-prober-will-not-be-executed-to-detect-other-bootable-partitions-systems-on-them-will-not-be-added-to-the-grub-boot-configuration