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Hi,
I would like to ask for some help in restoring my grub after an update.
I updated my system yesterday and accidently entered the following command before turning off the computer.
sudo grub-mkconfig -o /boot/grub/grub.cfgToday I turned on my computer again and the entire grub page is gone on boot and automatically redirects to the bios setting.
So I downloaded and created a bootable Arch linux ISO in an usb using another laptop.
Below are the steps that I have taken after booting with the usb stick.
1. Identified root partition and mount it:
mount /dev/nvme0n1p3 /mnt2. Mount EFI partition as well:
mount /dev/nvme0n1p1 /mnt/bootPlease note that dev/nvme0n1p2 is a swap partition.
3. Entered
arch-chroot /mnt 4. Editted /etc/default/grub and uncommented:
GRUB_DISABLE_OS_PROBER=false 4. Entered
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=GRUB
grub-mkconfig -o /boot/grub/grub.cfg Then I have the following messages:
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
ERROR: mkdir /var/lock/dmraid
grub-probe: error: cannot find a GRUB drive for /dev/sda1. Check your device.map.
Adding boot menu entry for UEFI Firmware Settings ...
Adding boot menu entry for UEFI Firmware Settings .../dev/sda1 is the usb directory. After reboot grub is back but only the two UEFI firmware items are shown.
I guess the grub-mkconfig command was not executed as expected and the installed arch linux was not detected.
At this point I do not know how I should proceed. Since I am not familiar with all these commands, I do not want to break my existing system.
I would appreciate any help in restoring my system. Thank you in advance.
Last edited by markean (2022-11-22 00:35:34)
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When you boot archiso I think you should not only mount your boot partition but also all partitions which you have in /etc/fstab into /mnt directory in their folders created for them by you, especially mount '/', '/home' , and then 'arch-chroot /mnt' and do your grub operations. You should see in output that everything is OK (os-prober may fail if you don't have windows installed on other partition).
If it still fail add --removable option at the end of command:
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=GRUB --removableLast edited by xerxes_ (2022-11-21 23:35:53)
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When you boot archiso I think you should not only mount your boot partition but also all partitions which you have in /etc/fstab into /mnt directory in their folders created for them by you, especially mount '/', '/home' , and then 'arch-chroot /mnt' and do your grub operations. You should see in output that everything is OK (os-prober may fail if you don't have windows installed on other partition).
If it still fail add --removable option at the end of command:
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=GRUB --removable
The following commands (in order) fixed the problem:
mount /dev/nvme0n1p3 /mnt
mount /dev/nvme0n1p1 /mnt/boot/efi
arch-chroot /mnt
grub-mkconfig -o /boot/grub/grub.cfg
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=grubI think changing the order of grub-mkconfig and grub-install and specifying /mnt/boot/efi instead of /mnt/boot were the keys.
Thank you!
Last edited by markean (2022-11-22 00:36:00)
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Do you usually mount your ESP to /boot or /boot/efi because what you've done now should match where they are normally mounted (e.g. in fstab or whatever). If you usually use /boot/efi, that's fine. But if you usually use /boot, you may run into trouble later if you don't correct it.
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