Knurpht-openSUSE wrote:
Op zaterdag 1 juni 2024 21:02:59 CEST schreef Richmond via openSUSE Users:
I have a PC with two operating systems installed, Debian, and Opensuse. Both are installed with Secure Boot. Each has its own grub installation. Normally I boot debian, and if I want to boot opensuse I select UEFI settings from the main menu and select opensuse from there which launches the opensuse grub. Today I booted opensuse, and did an update which included an update to grub. Now I cannot boot debian as it says bad shim or bad signature.
Each grub menu has the alternate O.S. on it, but booting debian from the opensuse grub menu did not work either.
Should I disable secure boot temporarily? will that allow booting? It should. Why not just give it a try?
I was afraid. But I have done it now and it worked thanks. Why did this happen? I have re-installed grub from debian, but I guess the next time opensuse upgrades grub it could happen again.