[Bug 1789507] Re: bionic upgrader fails quickly after downloads

[Brian Murray]

*** This bug is a duplicate of bug 1611737 ***
    https://bugs.launchpad.net/bugs/1611737

** This bug has been marked a duplicate of bug 1611737
   Can't upgrade from a release if ros packages are  installed from ROS servers

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https://bugs.launchpad.net/bugs/1789507

Title:
  bionic upgrader fails quickly after downloads

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

Bug description:
  upgrade performed with do-release-upgrade fails to find a solution and
  restores the previous system state while running in "screen". The
  failure occurs whether the upgrade is launched from gnome-terminal in
  the GUI or at the console, after the following messages:

  ...[various messages looking OK]...
  Calculating the changes

  Calculating the changes

  Do you want to start the upgrade?

  
  24 installed packages are no longer supported by Canonical. You can 
  still get support from the community. 

  267 packages are going to be removed. 746 new packages are going to 
  be installed. 3313 packages are going to be upgraded. 

  Fetching and installing the upgrade can take several hours. Once the 
  download has finished, the process cannot be canceled. 

   Continue [yN]  Details [d]y

  Lock screen disabled

  Your lock screen has been disabled and will remain disabled until you
  reboot.

  To continue please press [ENTER]
  Inhibiting until Ctrl+C is pressed...

  
  Fetching
  Fetched 0 B in 0s (0 B/s)

  Upgrading
  Inhibiting until Ctrl+C is pressed...
  Fetched 0 B in 0s (0 B/s)

  Upgrading
  Inhibiting until Ctrl+C is pressed...
  Fetched 0 B in 0s (0 B/s)
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done

  Calculating the changes

  Calculating the changes

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  This can be caused by:
  * Upgrading to a pre-release version of Ubuntu
  * Running the current pre-release version of Ubuntu
  * Unofficial software packages not provided by Ubuntu

  If none of this applies, then please report this bug using the
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

  
  Restoring original system state

  Aborting
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.15.0-33.36~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-33-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue Aug 28 23:49:25 2018
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-28 (0 days ago)
  VarLogDistupgradeApttermlog:
   Log started: 2018-08-28  23:48:28
   Log ended: 2018-08-28  23:48:32
   
   Log started: 2018-08-28  23:48:36
   Log ended: 2018-08-28  23:48:36

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