(/boot/efi not mounted) 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

[George]

crushed after system login

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: shim-signed 1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-78.99-generic 4.4.62
Uname: Linux 4.4.0-78-generic x86_64
.proc.sys.kernel.moksbstate_disabled: 0
.sys.firmware.efi.efivars.MokSBStateRT-605dab50-e046-4300-abb6-3dd810dd8b23: Error: [Errno 2] Нет такого файла или каталога: '/sys/firmware/efi/efivars/MokSBStateRT-605dab50-e046-4300-abb6-3dd810dd8b23'
.sys.firmware.efi.efivars.SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c: 

[Steve Langasek (vorlon)]

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?

[Launchpad Janitor (janitor)]

[Expired for shim-signed (Ubuntu) because there has been no activity for 60 days.]