Hello everyone!
This week I deleted my Manjaro partition using Windows (the /) and now I can’t boot to EndeavourOS, using Manjaro’s GRUB nor EndeavourOS’ GRUB. I can only boot to Windows. GRUB says “Filesystem unknown”. Any ideas on how to solve this?
Thank you very much!
I would try booting off the installer ISO, chrooting into your system using arch-chroot and then running sudo grub-mkconfig -o /boot/grub/grub.cfg.
If that doesn’t work, that boot off the ISO, go back into the arch-chroot and re-install grub.
If you need more detailed instructions for any of that, please let us know.
What is the output of efibootmgr?
This will tell you if you need to re-order your boot entries, chroot update grub, or chroot re-install grub.
[liveuser@eos-2021.02.03 ~]$ efibootmgr
BootCurrent: 0004
Timeout: 0 seconds
BootOrder: 0001,0003,0002,0006,0000,0005,2001,2002,2003
Boot0000* Unknown Device:
Boot0001* HDD0: TOSHIBA MQ04ABF100
Boot0002* Windows Boot Manager
Boot0003* Manjaro
Boot0004* USB HDD: KingstonDataTraveler 2.0
Boot0005* EndeavourOS
Boot0006* Unknown Device:
Boot2001* EFI USB Device
Boot2002* EFI DVD/CDROM
Boot2003* EFI Network
[liveuser@eos-2021.02.03 ~]$
How can I do that? Through the terminal?
sudo efibootmgr -o 0005,0002,0003,0001,0004,2001,2002,2003
Edit: After we could remove some of those entries that are not needed such as the manjaro.
To remove any entries not needed use the following.
sudo efibootmgr -b 0003 -B
Edit: This will remove the Manjaro entry and you can remove any others not required.
Ok so I just need to put that on the terminal?
If so, here’s the output:
[liveuser@eos-2021.02.03 ~]$ sudo efibootmgr -o 0005,0002,0003,0001,0004,2001,2002,2003
BootCurrent: 0004
Timeout: 0 seconds
BootOrder: 0005,0002,0003,0001,0004,2001,2002,2003
Boot0000* Unknown Device:
Boot0001* HDD0: TOSHIBA MQ04ABF100
Boot0002* Windows Boot Manager
Boot0003* Manjaro
Boot0004* USB HDD: KingstonDataTraveler 2.0
Boot0005* EndeavourOS
Boot0006* Unknown Device:
Boot2001* EFI USB Device
Boot2002* EFI DVD/CDROM
Boot2003* EFI Network
[liveuser@eos-2021.02.03 ~]$
Yes just put it in the terminal.
Now I can reboot?
You can check it after too.
sudo efibootmgr
I’ve rebooted and it still goes to GRUB Rescue with the same error 
Is it set to boot from EndeavourOS now?
If it’s set to boot from endeavourOS and you are getting this problem you may have to use the live iso and arch-chroot into the system to fix grub.
Edit: After arch-chroot into the system then use the procedure listed here to reinstall grub for UEFI.
What’s wrong?
[root@archiso /]# os-prober
/dev/sda1@/efi/Microsoft/Boot/bootmgfw.efi:Windows Boot Manager:Windows:efi
grub-probe: error: cannot find a GRUB drive for /dev/sdb1. Check your device.map.
[root@archiso /]# grub-mkconfig -o /boot/grub/grub.cfg
/usr/bin/grub-mkconfig: line 248: /boot/grub/grub.cfg.new: No such file or directory
[root@archiso /]#
Did you arch-chroot first and mount the proper drives?
Edit: You have to boot on the live ISO and follow the instructions in the first one to arch-chroot and mount the drives on the installed system then follow the UEFI instructions to reinstall grub.
Yes I followed those steps. Is there a way I can unmount and mount again the drives to check what’s wrong?
One thing: Wouldn’t it be better to just reinstall the system? My /home is on a separate partition.
Well that’s up to you but this will teach you how to repair your system when this happens or something else that you need to arch-chroot to be able to install something. It would be a good exercise for learning.
Hmm that’s right. What can I do now? How can I unmount the drives?
I think the command is umount.
Edit: sudo umount /mnt
Edit2: I think you can just type exit also?