[Bug 1879614] Re: update failed from 16.04 to 18.04

[Ubuntu Foundations Team Bug Bot]

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

** Tags added: xenial2bionic

** Tags added: third-party-packages

** 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/1879614

Title:
  update failed from 16.04 to 18.04

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

Bug description:
  
  正在检查软件包管理器
  正在读取软件包列表... 完成     
  正在分析软件包的依赖关系树        
  正在读取状态信息... 完成      

  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'. 

  
  正在恢复原始系统状态

  中止
  正在读取软件包列表... 完成     
  正在分析软件包的依赖关系树        
  正在读取状态信息... 完成

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.30
  ProcVersionSignature: Ubuntu 4.15.0-65.74~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-65-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed May 20 13:15:30 2020
  InstallationDate: Installed on 2019-01-16 (490 days ago)
  InstallationMedia: Ubuntu 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2020-05-20 (0 days ago)

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