The error in the logs is:
mount: /var/lib/grub/esp: wrong fs type, bad option, bad superblock on
/dev/sdb1, missing codepage or helper program, or other error.
dpkg: error processing package grub-efi-amd64-signed (--configure):
installed grub-efi-amd64-signed package post-installation script subprocess
returned error exit status 32
This does indeed look like grub is trying to find an ESP on a disk other
than the one Ubuntu is installed to. Could you show the output of 'sudo
fdisk -l /dev/sdb' for a start?
** Package changed: shim-signed (Ubuntu) => grub2 (Ubuntu)
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1887965
Title:
package shim-signed 1.40.3+15+1533136590.3beb971-0ubuntu1 failed to
install/upgrade: dependency problems - leaving triggers unprocessed
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