[Bug 1800750] Re: Error message during upgrade: "Error writing key update: Permission denied"

[Adrian Kalla]

Trying to do sudo dpkg-reconfigure secureboot-db ends with the same
error...

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Title:
  Error message during upgrade: "Error writing key update: Permission
  denied"

Status in secureboot-db package in Ubuntu:
  Confirmed

Bug description:
  New keys in filesystem:
   /usr/share/secureboot/updates/dbx/MS-2016-08-08.bin
  Inserting key update /usr/share/secureboot/updates/dbx/MS-2016-08-08.bin into dbx
  Error writing key update: Permission denied
  Error syncing keystore file /usr/share/secureboot/updates/dbx/MS-2016-08-08.bin

  This resulted from invoking "apt update" and "apt upgrade" from the
  command line (sudo'ed as root). The only package being upgraded was
  "secureboot-db".

  The system is running currently maintained 18.04.1 LTS.

  Secureboot is in fact disabled in the EFI.

  # apt-cache policy secureboot-db
  secureboot-db:
    Installed: 1.4~ubuntu0.18.04.1
    Candidate: 1.4~ubuntu0.18.04.1
    Version table:
   *** 1.4~ubuntu0.18.04.1 500
          500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1.1 500
          500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: secureboot-db 1.4~ubuntu0.18.04.1
  ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
  Uname: Linux 4.15.0-38-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.4
  Architecture: amd64
  Date: Tue Oct 30 21:04:26 2018
  InstallationDate: Installed on 2015-09-06 (1150 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: secureboot-db
  UpgradeStatus: Upgraded to bionic on 2018-04-23 (190 days ago)

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