[Bug 1571925] Re: grub-install: error: cannot find EFI directory.

[MB]

During the upgrading process from 15.10 to 16.04 , various warnings
occurred about dependencies which could not been resolved.

Now in 16.04 , but sudo apt-get dist-upgrade produces :

Paramétrage de shim-signed (1.12+0.8-0ubuntu2) ...
Installation pour la plate-forme x86_64-efi
grub-install : erreur : impossible de trouver le répertoire EFI.
dpkg: erreur de traitement du paquet shim-signed (--configure) :
 le sous-processus script post-installation installé a retourné une erreur de sortie d'état 1
Des erreurs ont été rencontrées pendant l'exécution :
 shim-signed
E: Sub-process /usr/bin/dpkg returned an error code (1)

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https://bugs.launchpad.net/bugs/1571925

Title:
  grub-install: error: cannot find EFI directory.

Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  $ sudo apt dist-upgrade
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Calculating upgrade... Done
  0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
  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] y
  Setting up grub-efi-amd64-signed (1.66+2.02~beta2-36ubuntu3) ...
  Installing for x86_64-efi platform.
  grub-install: error: cannot find EFI directory.
  dpkg: error processing package grub-efi-amd64-signed (--configure):
   subprocess installed post-installation script returned error exit status 1
  Errors were encountered while processing:
   grub-efi-amd64-signed
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: grub-efi-amd64-signed 1.66+2.02~beta2-36ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Mon Apr 18 21:05:54 2016
  InstallationDate: Installed on 2016-03-03 (47 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160122.2)
  SourcePackage: grub2-signed
  UpgradeStatus: No upgrade log present (probably fresh install)

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