Public bug reported:

I installed lubuntu 64bit version on a baytrail tablet & the installation 
failed while installing grub. I've managed to boot with the broken installation 
using the live usb. Im trying to fix the booting process using bootrepair but I 
get is this error. 
Creating config file /etc/default/grub with new version
Installing for x86_64-efi platform.
Could not prepare Boot variable: No space left on device
grub-install: error: efibootmgr failed to register the boot entry: Input/output 
error.
Failed: grub-install --target=x86_64-efi  
WARNING: Bootloader is not properly installed, system may not be bootable
Setting up linux-signed-generic (4.15.0.22.23) ...
Setting up grub-efi-amd64-signed (1.93+2.02-2ubuntu8) ...
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):
 installed grub-efi-amd64-signed package post-installation script subprocess 
returned error exit status 1
Processing triggers for linux-image-4.15.0-22-generic (4.15.0-22.24) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-4.15.0-22-generic
Processing triggers for ureadahead (0.100.0-20) ...
Processing triggers for shim-signed (1.34.9+13-0ubuntu2) ...
Errors were encountered while processing:
 grub-efi-amd64-signed
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-efi-amd64-signed 1.93+2.02-2ubuntu8
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
Date: Thu May 31 02:22:29 2018
DuplicateSignature:
 package:grub-efi-amd64-signed:1.93+2.02-2ubuntu8
 Setting up grub-efi-amd64-signed (1.93+2.02-2ubuntu8) ...
 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):
  installed grub-efi-amd64-signed package post-installation script subprocess 
returned error exit status 1
ErrorMessage: installed grub-efi-amd64-signed package post-installation script 
subprocess returned error exit status 1
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 failed to 
install/upgrade: installed grub-efi-amd64-signed package post-installation 
script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: grub2-signed (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package bionic

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https://bugs.launchpad.net/bugs/1774278

Title:
  package grub-efi-amd64-signed 1.93+2.02-2ubuntu8 failed to
  install/upgrade: installed grub-efi-amd64-signed package post-
  installation script subprocess returned error exit status 1

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