The error in your log is:
Setting up shim-signed (1.34.5+13-0ubuntu2) ...
Installing for x86_64-efi platform.
show_order(): Illegal seek
Skipping unreadable variable "Boot0000": Illegal seek
Skipping unreadable variable "Boot0001": Illegal seek
Skipping unreadable variable "Boot0003": Illegal seek
Skipping unreadable variable "Boot000B": Illegal seek
Skipping unreadable variable "Boot000C": Illegal seek
Could not add entry to BootOrder: Illegal seek
grub-install: error: efibootmgr failed to register the boot entry: No such
device or address.
ESC[1mdpkg:ESC[0m error processing package shim-signed (--configure):
installed shim-signed package post-installation script subprocess returned
error exit status 1
When you say "sophos running [...] blocking the update", do you mean
that you have some sort of anti-malware defense installed which is
preventing shim from accessing the boot config?
If so, that seems to me like not a bug in shim.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1766385
Title:
package shim-signed 1.34.5+13-0ubuntu2 failed to install/upgrade:
installed shim-signed package post-installation script subprocess
returned error exit status 1
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