Failed to start Remount Root and Kernel File Systems

[D3vil0p3r]

I'm using Arch Linux with Zen Kernel and I'm using grub-btrfs + snapper-support package.

I tried to restore a snapshot by GRUB by:

• Selecting GRUB entry snapshots
• Selecting the snapshot I need
• And in this last view, I have three entries
  • entry with the snapshot name
  • entry with kernel name
  • entry with kernel fallback

If I select the first entry with snapshot name, nothing happens so I select the entry with the kernel name.

When I do this, during the boot I get an error saying:

[FAILED] Failed to start Remount Root and Kernel File Systems.

and after some seconds I can land on the system. Effectively, the snapshot worked because the removed package are still here. The problem is that, if I try to run a command like sudo grub-mkconfig -o /boot/grub/grub.conf, I get the following error:

/usr/bin/grub-probe: error: failed to get canonical path of `rootfs'.

and it seems related to the error I get at the boot.

Then, if I reboot the system and I choose my usual GRUB entry, the system state is not continuing from the one of the previous selected snapshot, indeed I see my removed package actually removed.