The error in your log shows:
Running in non-interactive mode, doing nothing.
--- /var/lib/shim-signed/dkms-list 2018-08-23 09:15:24.219075416 -0500
+++ /var/lib/shim-signed/dkms-list.new 2018-08-23 09:15:24.231077094 -0500
@@ -1,2 +1,3 @@
/var/lib/dkms
+/var/lib/dkms/rtl8812au
/var/lib/dkms/virtualbox
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
E: Sub-process /usr/bin/dpkg returned an error code (1)
So you already have a dkms module installed on your system, but you have
not gone through the process to enable MOK for SecureBoot so that the
modules will be loadable under SecureBoot; and you are now installing
another dkms module, rtl8812au, but somehow this package's installation
is not shown in your dpkg logs and you did not answer the debconf
prompt; then you ran a non-interactive 'apt upgrade', which failed
because noninteractive means the prompt will still not be shown.
How did you install these dkms modules, that the prompts were not shown
to you?
You need to run apt -f install without DEBIAN_FRONTEND=noninteractive
being set in your environment in order to handle the SecureBoot prompts
and complete the upgrade.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1788627
Title:
package shim-signed 1.34.9.2+13-0ubuntu2 failed to install/upgrade:
installed shim-signed package post-installation script subprocess
returned error exit status 1
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