[Bug 1767357] [NEW] upgrade from 16.04 to 18.04 fails "Could not calculate the upgrade"

[Jeff Bauer]

Public bug reported:

I'm assuming this is a bug, because the application suggested that I
report it as such.  I waited until the (delayed) 18.04 official release.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.13.0-39.44~16.04.1-generic 4.13.16
Uname: Linux 4.13.0-39-generic i686
ApportVersion: 2.20.1-0ubuntu2.16
Architecture: i386
CrashDB: ubuntu
CurrentDesktop: i3
Date: Fri Apr 27 07:51:51 2018
InstallationDate: Installed on 2017-10-21 (187 days ago)
InstallationMedia: Xubuntu 16.04.3 LTS "Xenial Xerus" - Release i386 (20170801)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-04-27 (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: polkit-agent-helper-1: error response to PolicyKit daemon: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: No session for cookie
 Error executing command as another user: Not authorized
 
 This incident has been reported.
VarLogDistupgradeTermlog:

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


** Tags: apport-bug dist-upgrade i386 third-party-packages xenial

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https://bugs.launchpad.net/bugs/1767357

Title:
  upgrade from 16.04 to 18.04 fails "Could not calculate the upgrade"

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

Bug description:
  I'm assuming this is a bug, because the application suggested that I
  report it as such.  I waited until the (delayed) 18.04 official
  release.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.13.0-39.44~16.04.1-generic 4.13.16
  Uname: Linux 4.13.0-39-generic i686
  ApportVersion: 2.20.1-0ubuntu2.16
  Architecture: i386
  CrashDB: ubuntu
  CurrentDesktop: i3
  Date: Fri Apr 27 07:51:51 2018
  InstallationDate: Installed on 2017-10-21 (187 days ago)
  InstallationMedia: Xubuntu 16.04.3 LTS "Xenial Xerus" - Release i386 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-04-27 (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: polkit-agent-helper-1: error response to PolicyKit daemon: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: No session for cookie
   Error executing command as another user: Not authorized
   
   This incident has been reported.
  VarLogDistupgradeTermlog:

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