[Bug 2080571] Re: package shim-signed 1.40.10+15.8-0ubuntu1 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 32

[Benjamin Drung]

So this setup is not supported. The solution is to remove the EFI
support and reconfigure GRUB:

```
sudo apt remove shim-signed
sudo dpkg-reconfigure grub-pc
```

APT is happy now and the system continues running fine.

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Title:
  package shim-signed 1.40.10+15.8-0ubuntu1 failed to install/upgrade:
  installed shim-signed package post-installation script subprocess
  returned error exit status 32

Status in shim-signed package in Ubuntu:
  Invalid

Bug description:
  Upgrading shim-signed from 1.40.9+15.7-0ubuntu1 to
  1.40.10+15.8-0ubuntu1 failed:

   package:shim-signed:1.40.10+15.8-0ubuntu1
   Setting up shim-signed (1.40.10+15.8-0ubuntu1) ...
   mount: /var/lib/grub/esp: Spezialgerät /dev/disk/by-id/ata-Samsung_SSD_850_EVO_500GB_S3R3NF0JB21487T-part2 ist nicht vorhanden.
   dpkg: error processing package shim-signed (--configure):
    installed shim-signed package post-installation script subprocess returned error exit status 32

  This system a decade old (but still running strong) and does not support EFI.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27.27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: X-Cinnamon
  DistroRelease: Ubuntu 20.04
  EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2: EFI variables are not supported on this system.
  InstallationDate: Installed on 2020-08-08 (1496 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  Missing: /boot/efi/EFI/ubuntu directory is missing
  Package: shim-signed 1.40.10+15.8-0ubuntu1
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 5.4.0-195.215-generic 5.4.280
  Tags: focal third-party-packages
  Uname: Linux 5.4.0-195-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True

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