[Bug 1771598] Re: package sudo 1.8.21p2-3ubuntu1 failed to install/upgrade: installed sudo package pre-removal script subprocess returned error exit status 1

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Title:
  package sudo 1.8.21p2-3ubuntu1 failed to install/upgrade: installed
  sudo package pre-removal script subprocess returned error exit status
  1

Status in sudo package in Ubuntu:
  New

Bug description:
  Hi, I tried editing the sudoers that is located on my Ubuntu setup on
  Virtual Box, it didn't allow me to update sudoers due to permission
  issues. I changed the permission of sudoers to 777 and was able to add
  my user name into it, however after that I was not able to run few
  commands hence I got instruction from google to purge and re-install
  it however it started throwing error afterwards however I noticed that
  I was able to remove my username entries from it before re-installing.
  Please suggest if I would need to re-install ubuntu on my virtual box
  or the current setup would work as before ?

  Thanks,
  Mahesh Bhatia

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: sudo 1.8.21p2-3ubuntu1
  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
  AptOrdering:
   ubuntu-minimal:amd64: Purge
   sudo:amd64: Purge
   NULL: ConfigurePending
   NULL: PurgePending
   NULL: ConfigurePending
  Architecture: amd64
  Date: Wed May 16 16:17:51 2018
  ErrorMessage: installed sudo package pre-removal script subprocess returned error exit status 1
  InstallationDate: Installed on 2018-05-15 (1 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
  PythonDetails: /root/Error: command ['which', 'python'] failed with exit code 1:, Error: [Errno 2] No such file or directory: "/root/Error: command ['which', 'python'] failed with exit code 1:": "/root/Error: command ['which', 'python'] failed with exit code 1:", unpackaged
  RelatedPackageVersions:
   dpkg 1.19.0.5ubuntu2
   apt  1.6.1
  SourcePackage: sudo
  Title: package sudo 1.8.21p2-3ubuntu1 failed to install/upgrade: installed sudo package pre-removal script subprocess returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)
  VisudoCheck:
   /etc/sudoers: parsed OK
   /etc/sudoers.d/README: parsed OK
  mtime.conffile..etc.sudoers: 2018-05-16T16:12:29.233258

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