[Bug 1580217] [NEW] shim-signed only half-configured following ubuntu upgrade to 16.04

[eddy]

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

Status in shim-signed package in Ubuntu:
  New

Bug description:
  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% /

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