Latest update resulted in black screen, GRUB seems broken

Installing the latest Manjaro stable update on my daughter’s pc with pacman the usual way resulted in a blackscreen somehow.
After switching off the pc and rebooting GRUB was not able to boot a kernel.
I tried to fix this issue by chrooting from a live system and reinstalling grub - now I am stuck in grub-rescue on startup. I probably need to rebuild the GRUB config file but I am not sure how to do it properly.
Can anyone help?

from chroot rerun update again… if you are up to date and there were no errors, post output from:
mhwd-kernel -li

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pacman update resulted in: nothing to do
mhwd-kernel showed:
Kernels installed:
linux 515
linux 61

so reinstall kernels:
pacman -S linux515 linux61
then check with this if you are on efi or bios:

test -d /sys/firmware/efi && echo efi || echo bios

and reinstall grub, either in bios or efi, according to the output above:

exit chroot:

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Okay, the machine seems to be back into business! :grinning:
Thank you very much!

Any idea on what could have happened? I did not look to the screen the whole time during the update and the next thing I saw was the blackscreen…

no idea, but the update got messed up… either it froze, and you rebooted, or it got somehow interrupted, or the pc suspended… just dont leave updates unattended

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