The version of shim-signed that you were upgrading to is the release
version of shim-signed in 18.04. This version of shim-signed cannot be
supported; it is 4 years old, and missing all security updates to shim
that have been released in the past 4 years. It will quite simply
become unbootable at a future date.
The issue you're reporting is one that was fixed at some point in the
history of bionic. You should have bionic-updates enabled when
upgrading between releases.
The simplest way to achieve this is to use do-release-upgrader or
update-manager to manage the upgrade, which appears not to have been
done here.
** Changed in: shim-signed (Ubuntu)
Status: New => Fix Released
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1961641
Title:
package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade:
installed shim-signed package post-installation script subprocess
returned error exit status 1
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https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1961641/+subscriptions
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