(16.04, installing updates, shim-signed installed but system is not UEFI) 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

[S. Erik Hermo]

None that I can add.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: shim-signed 1.18~16.04.1+0.8-0ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
BootEFIContents:
 fw
 fwupx64.efi
Date: Fri Aug 12 22:57:02 2016
DuplicateSignature:
 package:shim-signed:1.18~16.04.1+0.8-0ubuntu2
 Setting up grub-efi-amd64-signed (1.66.2+2.02~beta2-36ubuntu3.2) ...
 grub-install: error: /usr/lib/grub/i386-pc/modinfo.sh doesn't exist. Please specify --target or --directory.
 dpkg: error processing package grub-efi-amd64-signed (--configure):
  subprocess installed post-installation script returned error exit status 1
EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2: efibootmgr: EFI variables are not supported on this system.
ErrorMessage: subprocess installed post-installation script returned error exit status 1
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: No upgrade log present (probably fresh install)

[Steve Langasek (vorlon)]

The log shows that you were upgrading from version 1.12+0.8-0ubuntu2 of shim-signed (in the xenial release pocket) to version 1.18~16.04.1+0.8-0ubuntu2 (in xenial-updates).

The error in your log is:

Setting up shim-signed (1.18~16.04.1+0.8-0ubuntu2) ...
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

You should have an EFI system partition mounted at /boot/efi, containing your existing bootloader.

Please show the output of the 'mount' command on your system.

[Steve Langasek (vorlon)]

I also see this line in your bug report:

 EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2: efibootmgr: EFI variables are not supported on this system.

Do you know if your system is an EFI system or not? All indications are that this system is booted in BIOS mode, but then it's unclear how you had the EFI bootloaders installed previously.

[Launchpad Janitor (janitor)]

[Expired for shim-signed (Ubuntu) because there has been no activity for 60 days.]