Preparing to unpack .../gir1.2-webkit2-4.0_2.16.2-0ubuntu0.16.04.1_amd64.deb ...
Unpacking gir1.2-webkit2-4.0:amd64 (2.16.2-0ubuntu0.16.04.1) over (2.16.1-0ubuntu0.16.04.2) ...
Preparing to unpack .../gir1.2-javascriptcoregtk-4.0_2.16.2-0ubuntu0.16.04.1_amd64.deb ...
Unpacking gir1.2-javascriptcoregtk-4.0:amd64 (2.16.2-0ubuntu0.16.04.1) over (2.16.1-0ubuntu0.16.04.2) ...
Preparing to unpack .../shim-signed_1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1_amd64.deb ...
Unpacking shim-signed (1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1) over (1.27~16.04.1+0.9+1474479173.6c180c6-1ubuntu1) ...
Setting up gir1.2-javascriptcoregtk-4.0:amd64 (2.16.2-0ubuntu0.16.04.1) ...
Setting up gir1.2-webkit2-4.0:amd64 (2.16.2-0ubuntu0.16.04.1) ...
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-ZKY00Y/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