package grub-efi-amd64-signed (not installed) failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Pamir Talazan]

in order to fix this problem i did:

apt-get purge grub\*
apt-get install grub-efi
apt-get autoremove
update-grub

and before that in order to boot the system i had to manually install grub from a live-usb:
mount /dev/sda2 /mnt
grub-install /dev/sda --root-directory=/mnt

the installed seems to mess up if your computer does efi boot but not secure boot.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: grub-efi-amd64-signed (not installed)
ProcVersionSignature: Ubuntu 4.8.0-58.63~16.04.1-generic 4.8.17
Uname: Linux 4.8.0-58-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.6
Architecture: amd64
Date: Tue Jul 4 19:11:29 2017
DuplicateSignature:
 package:grub-efi-amd64-signed:(not installed)
 Setting up grub-efi-amd64-signed (1.66.11+2.02~beta2-36ubuntu3.11) ...
 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
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2017-07-04 (0 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.20
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed (not installed) failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Olympia (olymbia-7)]

whenever i installed something it work but gave me an error message about grub.Today i installed an app from software center and it crashed.

[UlfZibis (ulf-zibis)]

See also bug 1767522