Solved - Error with shim-signed package when running updates

[CopperBlue]

When I run 'apt upgrade', 'apt update' etc, I get the following error:

Setting up shim-signed (1.40.10+15.8-0ubuntu1)
Mount /var/lib/grub/esp: special device /dev/sda1 does not exist
Dpkg: error processing package shim-signed

I think this fails because the /boot/efi partition in /etc/fstab is a UUID which links to /dev/sdc1 (which is correct). (/dev/sda is a raw data disk with no partitions)

The file /var/cache/debconf/config.dat has the following settings:

Name: grub-efi/install_devices
Template: grub-efi/install_devices
Value: /dev/sda1
Owners: grub-common, grub-efi-amd64, grub-pc
Flags: seen
Variables:
CHOICES:
RAW_CHOICES

Name: grub-efi/install_devices_disks_changed
Template: grub-efi/install_devices_disks_changed
Value: /dev/sda1, /dev/sdc1
Owners: grub-common, grub-efi-amd64,
Flags: seen
Variables:
CHOICES:
RAW_CHOICES

My questions are:
Can I just change the config.dat file to use /dev/sdc1?
Is there a command to do this rather than just edit the file?
What's caused this to happen in the first place when there are identical servers which behave correctly?

I'm wary about reinstalling grub etc as I don't know if this will do anything with /dev/sda.

Any help appreciated please.

 

[GatorsFan]

Look at your partitioning in Gparted and look at the /boot/efi partition and see if the esp flag is set or not if not try setting it then reboot

 

[CopperBlue]

Look at your partitioning in Gparted and look at the /boot/efi partition and see if the esp flag is set or not if not try setting it then reboot

Thanks for the suggestion. I'll give this a go and see what it looks like.

 

[CopperBlue]

Just run 'parted -l' and esp flag is set on /dev/sdc1, which is correct.
So it looks like the entry in /var/cache/debconf/config.dat is wrong. I just need to work out how to change that.

 

[CopperBlue]

Solution was this:

echo "grub-efi-amd64 grub-efi/install_devices multiselect /dev/sdc1" | debconf-set-selections

 

[wizardfromoz]

@CopperBlue when you are sure this is solved, you can mark it as such by going to your first post, and do as follows

Near bottom left of the post click Edit - (No Prefix) - Solved

Cheers

Chris Turner
wizardfromoz