[Bug 1852576] Re: cannot upgrade to Ubuntu 18 from Ubuntu 16

[Chris Guiver]

Thank you for taking the time to report this issue and helping to make
Ubuntu better.

Examining the information you have given us (esp. request at end), this
does not appear to be a bug report so we are closing it and converting
it to a question in the support tracker. We understand the difficulties
you are facing, but it is better to raise problems you are having in the
support tracker at https://answers.launchpad.net/ubuntu if you are
uncertain if they are bugs.

You can also find help with your problem in the support forum of your
local Ubuntu community http://loco.ubuntu.com/ or asking at
https://askubuntu.com or https://ubuntuforums.org, or for more support
options please look at https://discourse.ubuntu.com/t/community-
support/709

For help on reporting bugs, see
https://help.ubuntu.com/community/ReportingBugs.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

** Converted to question:
   https://answers.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+question/685868

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https://bugs.launchpad.net/bugs/1852576

Title:
  cannot upgrade to Ubuntu 18 from Ubuntu 16

Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid

Bug description:
  I was following the instructions present here 
  https://www.zdnet.com/article/how-to-upgrade-from-ubuntu-linux-16-04-to-18-04/

  to upgrade. I faced some issues with sudo apt update && sudo apt
  upgrade. Some of my packages were broken so had to remove them. I
  believe the update and upgrade commands work fine now. Executing sudo
  do-release-upgrade does not work and I always get this message on the
  terminal saying "Restoring original system state". I cannot see any
  specific errors that could help me debug this issue.

  Could I please get some assistant on this?

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.27
  ProcVersionSignature: Ubuntu 4.15.0-66.75~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-66-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu Nov 14 07:46:55 2019
  InstallationDate: Installed on 2018-09-29 (411 days ago)
  InstallationMedia: Ubuntu 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-11-14 (0 days ago)
  VarLogDistupgradeAptclonesystemstate.tar.gz: Error: command ['pkexec', 'cat', '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'] failed with exit code 127: pkexec must be setuid root

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