boot-repair should fix broken protective MBR

Bug #1810065 reported by Josh Haberman on 2018-12-30
This bug affects 1 person
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Bug Description

The Qubes installer corrupts the protective MBR on UEFI systems. This causes my UEFI firmware to ignore that disk. boot-repair did not detect or fix this problem.

I spent a long time troubleshooting, and eventually came across this, which exactly describes my problem and shows how to fix it:

gparted knows how to fix this problem:

> Warning: The 0xEE protective partition in the MBR is marked as active. This is
> technically a violation of the GPT specification, and can cause some EFIs to
> ignore the disk, but it is required to boot from a GPT disk on some BIOS-based
> computers. You can clear this flag by creating a fresh protective MBR using
> the 'n' option on the experts' menu.

boot-repair should detect and fix this problem like gparted does.

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