The error in your log is:
Processing triggers for shim-signed (1.33.1~16.04.1+13-0ubuntu2) ...
debconf: unable to initialize frontend: Passthrough
debconf: (Cannot connect to /tmp/aptdaemon-axiu4xkn/debconf.socket: Connection
refused at (eval 18) line 3.)
debconf: falling back to frontend: Noninteractive
Running in non-interactive mode, doing nothing.
--- /var/lib/shim-signed/dkms-list 2018-05-10 23:25:36.454504385 -0400
+++ /var/lib/shim-signed/dkms-list.new 2018-05-10 23:25:36.458504109 -0400
@@ -0,0 +1,3 @@
+/var/lib/dkms
+/var/lib/dkms/bbswitch
+/var/lib/dkms/nvidia-384
dpkg: error processing package shim-signed (--configure):
subprocess installed post-installation script returned error exit status 1
This indicates that the package manager frontend was shut down while
package configuration was still in progress. You must have a valid
package manager frontend in order to correctly configure the UEFI Secure
Boot bootloader for use with dkms modules.
To correct this issue, you will want to run 'sudo dpkg --configure -a'
from a terminal.
** Changed in: shim-signed (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1770544
Title:
Unable to lock the administration directory
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