[Bug 1769576] Re: not able to upgrade from ubuntu 16.04 to 18

[umar ata]

root at umarUbuntu:/home/umar# ppa-purge script
Updating packages lists
PPA to be removed: script ppa
Warning:  Could not find package list for PPA: script ppa


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

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https://bugs.launchpad.net/bugs/1769576

Title:
  not able to upgrade from ubuntu 16.04 to 18

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

Bug description:
  I used this command to upgrade my ubuntu 16.04 to 18

  sudo do-release-upgrade -d

  
  then I got the following error 

  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 4.13.0-39.44~16.04.1-generic 4.13.16
  Uname: Linux 4.13.0-39-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.20.1-0ubuntu2.16
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Mon May  7 12:32:09 2018
  InstallationDate: Installed on 2017-08-03 (276 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-05-07 (0 days ago)

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