[Bug 1769102] Re: attempted to upgrade to 18.04 and it failed for an unknown reason

[dino99]

Your 'unknown' reason:

*******
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  <<<<<  your unknown reason
**************

So start downgrading to genuine versions, via ppa-purge; then clean the system with autoremove, and finally update/upgrade.
Then dist-upgrading should be happier.


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

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https://bugs.launchpad.net/bugs/1769102

Title:
  attempted to upgrade to 18.04 and it failed for an unknown reason

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

Bug description:
  The software update notification popped up about packages that could
  be updated while the release updateer was running

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: ubuntu-release-upgrader-core 1:17.10.11
  ProcVersionSignature: Ubuntu 4.13.0-39.44-generic 4.13.16
  Uname: Linux 4.13.0-39-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.7-0ubuntu3.8
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: X-Cinnamon
  Date: Fri May  4 12:23:27 2018
  InstallationDate: Installed on 2012-10-18 (2023 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to artful on 2018-05-04 (0 days ago)

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