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So, I installed Mint on an external SSD just because I had it laying around, and I found it entertaining to do so.

Now when I boot my laptop without the external Mint SSD plugged in, it goes to GRUB and won't boot Ubuntu.

Once Ubuntu boots with the SSD, I can eject and remove it, and the system continues to run absolutely fine. I don't want to have to lug the hard drive around with my laptop everywhere I go...

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    Sounds like the boot loader partition got installed to the external SSD.
    – Thomas Ward ♦
    Apr 27, 2020 at 1:22

1 Answer 1

Reset to default
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Once booted into Ubuntu, unplug your external hard drive and run sudo update-grub and sudo grub-install /dev/nvme0n1

You can manually edit your /boot/grub/grub.cfg but this file will get overwritten when you run update-grub.

All the best!

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    Awesome! Thanks, Balls!
    – Ender
    Apr 27, 2020 at 14:20

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