Comment 2 for bug 1723437

The error in your log is:

Processing triggers for shim-signed (1.32~16.04.1+0.9+1474479173.6c180c6-1ubuntu1) ...
debconf: unable to initialize frontend: Passthrough
debconf: (Cannot connect to /tmp/aptdaemon-4wk65r8d/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 2017-10-13 22:05:36.867828964 +0700
+++ /var/lib/shim-signed/dkms-list.new 2017-10-13 22:05:36.871828963 +0700
@@ -0,0 +1,3 @@
+/var/lib/dkms
+/var/lib/dkms/bbswitch
+/var/lib/dkms/nvidia-375
dpkg: error processing package shim-signed (--configure):
 subprocess installed post-installation script returned error exit status 1

This error message indicates that for some reason, software-properties disconnected the aptdaemon debconf socket before installation completed.

To finish installation of these packages, you can run the following command from a terminal:
  sudo dpkg --configure -a