[Bug 1854874] Re: errors while upgrade from 16.04 to 18.04

[Chris Guiver]

*** 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/1854874

Title:
  errors while upgrade from 16.04 to 18.04

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

Bug description:
  command:sudo do-release-upgrade
  正在计算变更

  正在计算变更

  无法计算升级

  An unresolvable problem occurred while calculating the upgrade.

  This was likely caused by: 
  * Unofficial software packages not provided by Ubuntu 
  Please use the tool 'ppa-purge' from the ppa-purge 
  package to remove software from a Launchpad PPA and 
  try the upgrade again. 

  如果这些都不生效，请在终端中使用命令 'ubuntu-bug ubuntu-release-upgrader-core' 来报告 
  bug。If you want to investigate this yourself the log files in 
  '/var/log/dist-upgrade' will contain details about the upgrade. 
  Specifically, look at 'main.log' and 'apt.log'.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.29
  ProcVersionSignature: Ubuntu 4.15.0-72.81~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-72-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue Dec  3 07:46:30 2019
  InstallationDate: Installed on 2019-10-28 (35 days ago)
  InstallationMedia: Ubuntu 16.04.6 LTS "Xenial Xerus" - Release amd64 (20190227)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-12-02 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2019-12-03T07:38:36.791583

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