[Bug 1776272] Re: Could not prepare Boot variable: No space left on device (package grub-efi-amd64-signed 1.93+2.02-2ubuntu8 [origin: Ubuntu] failed to install/upgrade: Unterprozess installed grub-efi-amd64-signed package post-installation script gab den Fehler-Ausgangsstatus 1 zurück)

[UlfZibis]

*** This bug is a duplicate of bug 1767570 ***
    https://bugs.launchpad.net/bugs/1767570

The first installation on this machine is Ubuntu-32 16.04. The problem occurred after installing a 2nd system, Ubuntu-32 18.04 with ubiquity -b and only with apt-get install grub-efi-amd64-signed, not with grub-efi-amd64.
After failed installation of grub-efi-amd64-signed the GRUB installation of the 1st system was broken, so I couldn't boot anymore and I had to repair Grub via live-media and chroot.

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https://bugs.launchpad.net/bugs/1776272

Title:
  Could not prepare Boot variable: No space left on device (package
  grub-efi-amd64-signed 1.93+2.02-2ubuntu8 [origin: Ubuntu] failed to
  install/upgrade: Unterprozess installed grub-efi-amd64-signed package
  post-installation script gab den Fehler-Ausgangsstatus 1 zurück)

Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  Bug report popped up during kernel upgrade

  ProblemType: Package
  DistroRelease: Ubuntu Kylin 18.04
  Package: grub-efi-amd64-signed 1.93+2.02-2ubuntu8 [origin: Ubuntu]
  ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
  Uname: Linux 4.15.0-22-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Mon Jun 11 20:05:34 2018
  ErrorMessage: Unterprozess installed grub-efi-amd64-signed package post-installation script gab den Fehler-Ausgangsstatus 1 zurück
  InstallationDate: Installed on 2017-10-28 (226 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
  PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
  RelatedPackageVersions:
   dpkg 1.19.0.5ubuntu2
   apt  1.6.1
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed 1.93+2.02-2ubuntu8 [origin: Ubuntu] failed to install/upgrade: Unterprozess installed grub-efi-amd64-signed package post-installation script gab den Fehler-Ausgangsstatus 1 zurück
  UpgradeStatus: Upgraded to bionic on 2018-05-07 (35 days ago)

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