[Bug 1852576] [NEW] cannot upgrade to Ubuntu 18 from Ubuntu 16

[Radhen]

Public bug reported:

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

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade xenial

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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:
  New

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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