[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]

Your fstab and your mount output both confirm that you have no ESP
mounted or configured to be mounted.  But it's also equally clear that
you have an EFI system.  Did you perhaps install this system in BIOS
mode, and then switch it to EFI mode in the firmware afterwards?

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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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