Thanks for filing a bug and helping to make Ubuntu better!
I believe the bug you have filed should be resolved with the new version
of shim-signed:
shim-signed (1.34.7) bionic; urgency=medium
* debian/shim-signed.postinst: it's not guaranteed that all linux-image
packages currently installed have dkms modules built for them.
Gracefully handle any failures in the path for signing existing dkms
modules on upgrade due to absent modules. LP: #1766391.
* Add a dependency on sbsigntool for kmodsign, which we use directly.
With that being the case, could you confirm that when you upgrade to this
package you are correctly prompted for a password to enroll a new MOK key?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1766564
Title:
package shim-signed 1.34.6+13-0ubuntu2 failed to install/upgrade:
installed shim-signed package post-installation script subprocess
returned error exit status 5
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