The error in your log is:
Setting up shim-signed (1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1) ...
debconf: unable to initialize frontend: Passthrough
debconf: (Cannot connect to /tmp/gnome-software-VLMW0Y/debconf.socket:
Connection refused at (eval 18) line 3.)
debconf: falling back to frontend: Noninteractive
Installing for x86_64-efi platform.
grub-install: error: cannot open `/boot/efi/EFI/ubuntu/shimx64.efi': No such
file or directory.
dpkg: error processing package shim-signed (--configure):
subprocess installed post-installation script returned error exit status 1
Is /boot/efi/ not mounted? If not, do you know why it isn't?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1694613
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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