Setting up grub-common (2.02~beta2-9ubuntu1.7) ...
Setting up grub2-common (2.02~beta2-9ubuntu1.7) ...
Setting up grub-efi-amd64-bin (2.02~beta2-9ubuntu1.7) ...
Setting up grub-efi-amd64 (2.02~beta2-9ubuntu1.7) ...
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
dpkg: error processing package grub-efi-amd64 (--configure):
 subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of grub-efi-amd64-signed:
 grub-efi-amd64-signed depends on grub-efi-amd64 (= 2.02~beta2-9ubuntu1.7); however:
  Package grub-efi-amd64 is not configured yet.

dpkg: error processing package grub-efi-amd64-signed (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
Errors were encountered while processing:
 grub-efi-amd64
 grub-efi-amd64-signed
E: Sub-process /usr/bin/dpkg returned an error code (1)