[Bug 1896172] Re: broken python dependency

[Brian Murray]

The upgrade failed to calculate as you are using a non-official mirror
of the Ubuntu archive.

2020-09-18 12:09:12,978 DEBUG examining: 'deb http://mirrors.bit.edu.cn/ubuntu/ eoan main restricted universe multiverse'
2020-09-18 12:09:12,980 DEBUG entry '# deb http://mirrors.bit.edu.cn/ubuntu/ focal main restricted universe multiverse # 已禁止升级到 focal' was disabled (unknown mirror) 
2020-09-18 12:09:12,980 DEBUG examining: 'deb-src http://mirrors.bit.edu.cn/ubuntu/ eoan main restricted universe multiverse'
2020-09-18 12:09:12,981 DEBUG entry '# deb-src http://mirrors.bit.edu.cn/ubuntu/ focal main restricted universe multiverse # 已禁止升级到 focal' was disabled (unknown mirror) 
2020-09-18 12:09:12,981 DEBUG examining: 'deb http://mirrors.bit.edu.cn/ubuntu/ eoan-security main restricted universe multiverse'
2020-09-18 12:09:12,982 DEBUG entry '# deb http://mirrors.bit.edu.cn/ubuntu/ eoan-security main restricted universe multiverse # 已禁止升级到
 focal' was disabled (unknown mirror) 

Please try switching mirrors of the Ubuntu archive and try the upgrade
again.

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

** Summary changed:

- broken python dependency
+ cannot upgrade with mirrors.bit.edu.cn

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https://bugs.launchpad.net/bugs/1896172

Title:
  cannot upgrade with mirrors.bit.edu.cn

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

Bug description:
  I ran following command to upgrade my dist,but it fails.It seems like the dependency of python and qt is broken. 
  ```
  sudo apt-get update
  sudo apt-get dist-upgrade
  sudo do-release-upgrade desktop
  ```
  I installed steam on my system.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: ubuntu-release-upgrader-core 1:19.10.15.4
  ProcVersionSignature: Ubuntu 5.3.0-64.58-generic 5.3.18
  Uname: Linux 5.3.0-64-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.9
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Fri Sep 18 12:11:02 2020
  InstallationDate: Installed on 2019-11-01 (321 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to eoan on 2020-09-18 (0 days ago)

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