[Bug 1930077] Re: installed shim-signed package post-installation script subprocess returned error exit status 1

[Boulesteix]

Try to install both Kubuntu & Ubuntu 21.04 and get the same error and
impossible to complete the installation.

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https://bugs.launchpad.net/bugs/1930077

Title:
  installed shim-signed package post-installation script subprocess
  returned error exit status 1

Status in ubiquity package in Ubuntu:
  Confirmed

Bug description:
  Release: Kubuntu 21.04
  SW, version: ubiquity, 21.04.19

  How to reproduce:
  1) Try installing Kubuntu (I tried from live-session, not tried direct install)

  Expected:
  Installation completes normally.

  Actual:
  Installer crashes with error message `installed shim-signed package post-installation script subprocess returned error exit status 1`.


  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: ubiquity 21.04.19
  ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12
  Uname: Linux 5.11.0-16-generic x86_64
  ApportVersion: 2.20.11-0ubuntu65
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.461
  CurrentDesktop: KDE
  Date: Fri May 28 20:01:57 2021
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/kubuntu.seed maybe-ubiquity quiet splash ---
  LiveMediaBuild: Kubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
  RebootRequiredPkgs:
   linux-image-5.11.0-16-generic
   linux-image-5.11.0-17-generic
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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