Hi. The package grub-pc 2.02~beta2-36ubuntu3.1 does function properly on this virtualized test system : update-grub[2], grub-mkconfig work as espected. Still, this warning shows up on login. (auto-message follows up) failed to install/upgrade: subprocess installed pre-removal script returned error exit status 10

[kozaki]

~$ lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: grub-pc 2.02~beta2-36ubuntu3.1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic i686
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: i386
Date: Wed Aug 3 20:53:46 2016
Df:
 Filesystem 1K-blocks Used Available Use% Mounted on
 /dev/sda8 5635188 3421112 1904780 65% /
 devtmpfs 10240 0 10240 0% /dev
 tmpfs 414536 5588 408948 2% /run
DpkgTerminalLog:
 Removing grub-pc (2.02~beta2-36ubuntu3.1) ...
 dpkg: error processing package grub-pc (--purge):
  subprocess installed pre-removal script returned error exit status 10
DuplicateSignature:
 package:grub-pc:2.02~beta2-36ubuntu3.1
 Removing grub-pc (2.02~beta2-36ubuntu3.1) ...
 dpkg: error processing package grub-pc (--purge):
  subprocess installed pre-removal script returned error exit status 10
ErrorMessage: subprocess installed pre-removal script returned error exit status 10
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic root=UUID=d6a187f0-4ecf-451d-9db9-313e089eb6de ro zwap.enabled=1 zswap.max_pool_percent=33 quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: grub2
Title: package grub-pc 2.02~beta2-36ubuntu3.1 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 10
UpgradeStatus: No upgrade log present (probably fresh install)