Ubuntu – After upgrading dual boot system from 19.04 to 19.10, unable to boot into Windows from grub menu

19.10bootgrub2uefiwindows

After upgrade to 19.10 on my dual boot system I am unable to boot into Windows.

If I change boot order in the BIOS and put windows boot manager first I can boot into Windows no problem.

However… from the grub menu when I select Windows boot manager the screen flashes and I'm back at the grub menu. So I do see Windows as an option in grub, it just doesn't boot.

I used sudo grub-update

and boot-repair

here is the log:
https://paste.ubuntu.com/p/rJPfP9WwSs/

Best Answer

Apparently this is a bug in Grub 2.04, which is shipped by Ubuntu 19.10.

See: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1839317 https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1845289

You might consider either downgrading the version of Grub on your system or waiting for a fixed version.

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