[Bug 1670222] Re: (/boot/efi not mounted) package shim-signed 1.23+0.9+1474479173.6c180c6-0ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Steve Langasek]

> The current host has fedora installed first so grub is
> maintained by it instead. Hence mounting /boot/efi doesn't
> seems necessary.

If you are running in a secureboot environment with standard Microsoft
keys in firmware, you will not be able to boot the Ubuntu kernel from
Fedora's GRUB; you need to use Ubuntu's shim and GRUB for this
(technically only Ubuntu's shim, but you need a GRUB to go with it and
it might as well be the Ubuntu GRUB).  This is one reason why dual
booting on UEFI systems is typically handled in the UEFI menu itself
rather than in the GRUB menu.

If you don't want to use Ubuntu's grub, you /can/ uninstall the shim,
shim-signed, and grub-efi-amd64'*' packages, and then you don't need to
mount /boot/efi during upgrades.

In any case, it sounds like this was a local configuration error
(removing /boot/efi from /etc/fstab), so closing this bug report as
invalid.  Thanks!

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

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Title:
  (/boot/efi not mounted) package shim-signed
  1.23+0.9+1474479173.6c180c6-0ubuntu1 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

Status in shim-signed package in Ubuntu:
  Invalid

Bug description:
  during 16.10 to 17.04 update, this popped up
  GRUB is not maintained by Ubuntu on this computer

  ProblemType: Package
  DistroRelease: Ubuntu 17.04
  Package: shim-signed 1.23+0.9+1474479173.6c180c6-0ubuntu1
  ProcVersionSignature: Ubuntu 4.8.0-39.42-generic 4.8.17
  Uname: Linux 4.8.0-39-generic x86_64
  NonfreeKernelModules: wl nvidia_modeset nvidia
  ApportVersion: 2.20.4-0ubuntu2
  Architecture: amd64
  BootEFIContents:
   fw
   fwupx64.efi
  Date: Mon Mar  6 08:34:18 2017
  DuplicateSignature:
   package:shim-signed:1.23+0.9+1474479173.6c180c6-0ubuntu1
   Installing for x86_64-efi platform.
   grub-install: error: cannot find EFI directory.
   dpkg: error processing package shim-signed (--configure):
    subprocess installed post-installation script returned error exit status 1
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  InstallationDate: Installed on 2016-12-02 (93 days ago)
  InstallationMedia: Ubuntu-GNOME 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160720)
  RelatedPackageVersions:
   dpkg 1.18.10ubuntu1
   apt  1.4~rc2
  SourcePackage: shim-signed
  Title: package shim-signed 1.23+0.9+1474479173.6c180c6-0ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: Upgraded to zesty on 2017-03-06 (0 days ago)

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