Public bug reported:

System was working fine, just upgraded to 16.04. There were errors during 
installation and apt now reports that shim-signed isn't properly installed with 
error
grub-install: error: cannot find EFI directory.


> sudo apt-get install shim-signed
Reading package lists... Done
Building dependency tree       
Reading state information... Done
shim-signed is already the newest version (1.12+0.8-0ubuntu2).
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] 
Setting up shim-signed (1.12+0.8-0ubuntu2) ...
Installing for x86_64-efi platform.
grub-install: error: cannot find EFI directory.
dpkg: error processing package shim-signed (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 shim-signed
E: Sub-process /usr/bin/dpkg returned an error code (1)


> lsb_release -rd
Description:    Ubuntu 16.04 LTS
Release:        16.04

> apt-cache policy shim-signed
shim-signed:
  Installed: 1.12+0.8-0ubuntu2
  Candidate: 1.12+0.8-0ubuntu2
  Version table:
 *** 1.12+0.8-0ubuntu2 500
        500 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

I've checked a couple of existing shim-signed bugs; they seem to focus on the 
/boot/efi directory being missing, but I have one:
> du /boot/eft
4       /boot/efi/EFI/ubuntu/fw
72      /boot/efi/EFI/ubuntu
76      /boot/efi/EFI
80      /boot/efi/

> df /boot
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/sdb4       28704764 8583044  18640556  32% /

** Affects: shim-signed (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1580217

Title:
  shim-signed only half-configured following ubuntu upgrade to 16.04

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