What did you see here that makes you think update-secureboot-policy was
forking and exiting?
The output shows that your debconf interface was in an inconsistent
state:
Setting up shim-signed (1.18~14.04.1+0.8-0ubuntu2) ...
Installing for x86_64-efi platform.
Installation finished. No error
** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1614675
Title:
package shim-signed 1.18~14.04.1+0.8-0ubuntu2 failed to
install/upgrade: the postinst ran
