Regaining grub control (multiboot)

[marlenejo]

I have a three multi-boot OS system, Mint 18.3, Xubuntu 17.10 and windows 7. Xubuntu reside on an SSD which I will like to remove for another computer. I can delete its partitions from Mint however since Xubuntu was installed after Mint, it seems to own the grub loader and no MInt kernel update will register in grub until I re-run a grub update on Xubuntu (grub-customizer) . Then the new MInt kernel will register in the boot menu.

Now I am afraid that by just removing Xubuntu partitions (or the drive), I still won't be able run kernel update from Mint to register. My question is how to get Mint to safely regain grub control before/after the deletions or removal ?

[kyphi]

You will have to edit /etc/fstab and remove the UUID entry for the drive you have removed and then run update-grub. If necessary you can rewrite the MBR pointing to Mint using Grub-customizer.

[marlenejo]

You will have to edit /etc/fstab and remove the UUID entry for the drive you have removed and then run update-grub. If necessary you can rewrite the MBR pointing to Mint using Grub-customizer.

In Mint, that drive (xubuntu) is not mounted in /etc/fstab and not use in Mint. I think "saving" in grub-customizer is the same as the "update-grub" command.

[MrEen]

Assuming Mint is on sda:

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sudo grub-install /dev/sda

Then:

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sudo update-grub

Please wait for confirmation on this as I only have experience with single drives.

This is from within Mint.