Plesk or system upgrade fails: error processing package shim-signed

Symptoms

Plesk or system update fails with the error message:

dpkg: error processing package shim-signed (--configure):
installed shim-signed package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
shim-signed

Cause

shim-signed is a package related to BIOS in Ubuntu. When Plesk tries to install components or updates, the operating system package manager process will fail because of the broken shim-signed package.

Resolution

1. Connect to the Plesk server via SSH.

2. Reconfigure dpkg database:

   # dpkg --configure -a