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Didn't quite know where to put this post.
My PC suddenly today would not boot. It says "Reboot and Select proper Boot device [...]" when I try to boot it. I didn't do anything yesterday that could explain this.
I chroot'd in to the disk where Linux is installed, made sure that the ESP partition has boot flag enabled, and ran `grub-mkconfig -o /boot/grub/grub.cfg` just in case that was somehow messed up.
I double checked that the UUIDs in /etc/fstab are correct (if that helps...)
When booting, I pressed Delete to explicitly select the disk on which Linux is installed.
Still the same...
Any idea what I can try next?
Last edited by Ploppz (2021-05-01 14:56:08)
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Are you booting legacy or UEFI? If it's the latter you may try to explicitly set the EFI partition using efiboomgr.
Other steps I would perform:
- extract all your data
- fsck
- doing a reinstall and then restore your old system
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Ah, luckily I did not have to resolve to that:
I had to _properly_ reinstall GRUB by first actually mounting the ESP and `grub-install --target=x86_64-efi --efi-directory=esp --bootloader-id=GRUB`.
Then I could boot!
Does anyone have any idea what could have caused this, given the solution? Some memory in the BIOS got wiped?
In that case, which command does actually reinsert the values into the BIOS memory? Is it grub-install? In my understanding grub-install puts things on the ESP partition.
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