The error in your log is:
Setting up shim-signed (1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1) ...
Installing for x86_64-efi platform.
efibootmgr: Could not delete Boot0001: Invalid argument
efibootmgr: Could not delete boot variable: Invalid argument
** Warning ** : Boot0001 has same label ubuntu
efibootmgr: Could not set variable Boot0002: No such file or directory
efibootmgr: Could not prepare boot variable: No such file or directory
Installation finished. No error reported.
Running in non-interactive mode, doing nothing.
dpkg: error processing package shim-signed (--configure):
subprocess installed post-installation script returned error exit status 1
You clearly have a UEFI system, but for some reason the UEFI variables
cannot be modified from the OS. This looks like a firmware problem to
me. Do you still have problems applying updates if you reboot your
system and try again?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1696741
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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