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I am going to reinstall my Ubuntu 20.04 on an external HDD. But since the first time I did so, after a few times of restarting and switching between Windows 10 and Ubuntu, the GNU Grub menu started to come up and I had to enter exit to get into Windows, suddenly the Dual Boot menu did not come up at all.

I checked the system information and the Boot mode is UEFI.

So I would like to know, which measures to take to avoid this stupid and persistent bug lasting from the early versions of Ubuntu?

Update:

I followed the instructions here https://linuxhint.com/fix-broken-ubuntu-without-reinstalling/

But still I have ACPI Bios error when Ubuntu boots

ACPI Bios Error Screen

FabioSpaghetti
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1 Answers1

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This is not strictly an answer but a suggestion. I run Ubuntu and Windows 11. But I am using BIOS to boot from a different device. This way my Windows and Linux never clash.

phi3nix
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