[Bug 1625138] Re: package shim-signed 1.18~16.04.1+0.8-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Steve Langasek]

The error in your logs is:

Setting up shim-signed (1.18~16.04.1+0.8-0ubuntu2) ...
Installation pour la plate-forme x86_64-efi
grub-install : erreur : impossible de trouver le répertoire EFI.
dpkg: error processing package shim-signed (--configure):
 subprocess installed post-installation script returned error exit status 1

Please attach your /etc/fstab file and show the output of the 'mount'
command.

** Changed in: shim-signed (Ubuntu)
       Status: New => Incomplete

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Title:
  package shim-signed 1.18~16.04.1+0.8-0ubuntu2 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

Status in shim-signed package in Ubuntu:
  Incomplete

Bug description:
  E: shim-signed: le sous-processus script post-installation installé a
  retourné une erreur de sortie d'état 1

  W: Can't drop privileges for downloading as file
  '/var/cache/apt/archives/partial/gparted_0.25.0-1_amd64.deb' couldn't
  be accessed by user '_apt'. - pkgAcquire::Run (13: Permission non
  accordée)

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: shim-signed 1.18~16.04.1+0.8-0ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
  Uname: Linux 4.4.0-36-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  BootEFIContents:
   fw
   fwupx64.efi
  Date: Mon Sep 19 09:37:37 2016
  EFIBootMgr:
   BootCurrent: 0001
   Timeout: 1 seconds
   BootOrder: 0001,0002
   Boot0001* ubuntu	HD(1,GPT,b149cac3-1c2b-4cbc-8772-76e883226b9a,0x800,0x100000)/File(\EFI\Ubuntu\grubx64.efi)
   Boot0002* Hard Drive 	BBS(HD,,0x0)AMGOAMNO........o.W.D.C. .W.D.5.0.0.3.A.B.Y.Z.-.0.1.1.F.A.0....................A...........................>..Gd-.;.A..MQ..L. . . . .W. .-.D.M.W.Y.A.0.P.9.F.Z.0.D.F......AMBO
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  InstallationDate: Installed on 2015-07-13 (433 days ago)
  InstallationMedia: Lubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.1
   apt  1.2.12~ubuntu16.04.1
  SourcePackage: shim-signed
  Title: package shim-signed 1.18~16.04.1+0.8-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: Upgraded to xenial on 2016-09-19 (0 days ago)

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