[Bug 1784234] Re: Ubuntu 18.04 upgrade from 16.04 failed

[Srinivas Anumala]

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 


User might have installed other Softwares, as per their need.

It would be great, to display details what Softwares are causing Ubuntu
Release upgrade.

Can Ubuntu be able to remove or upgrade them at back-end and notify user
accordingly ??

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https://bugs.launchpad.net/bugs/1784234

Title:
  Ubuntu 18.04 upgrade from 16.04 failed

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

Bug description:
  I have removed all packages and retried upgrade.  Its failing with
  same reason  "Could not calculate upgrade"

  What else is missing here ?? :(

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.15.0-29.31~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-29-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun Jul 29 11:55:29 2018
  InstallationDate: Installed on 2018-04-22 (98 days ago)
  InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-07-29 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update-manager.release-upgrades: 2018-07-28T20:03:58.267947

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