The error in your log is:
debconf: unable to initialize frontend: Passthrough
debconf: (Cannot connect to /tmp/aptdaemon-klnuxv1j/debconf.socket: Connection
refused at (eval 18) line 3.)
debconf: falling back to frontend: Noninteractive
Running in non-interactive mode, doing nothing.
dpkg: error processing package shim-signed (--configure):
subprocess installed post-installation script returned error exit status 1
I see that this happens when you are installing some dkms packages
(bbswitch-dkms, and nvidia). How have you selected these for
installation? Did you use the 'Software & Updates' Additional Drivers
GUI?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1694513
Title:
package shim-signed 1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1
failed to install/upgrade: subprocess installed post-installation
script returned error exit status 1
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