[Bug 1898784] Re: do-release-upgrade crashed with AttributeError in calcDistUpgrade(): 'DistUpgradeController' object has no attribute 'tasks'

[Brian Murray]

** Information type changed from Private to Public

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https://bugs.launchpad.net/bugs/1898784

Title:
  do-release-upgrade crashed with AttributeError in calcDistUpgrade():
  'DistUpgradeController' object has no attribute 'tasks'

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

Bug description:
  Did an install that already failed once because it was spontaneously switching to ipv6 to download, then failing all downloads.
  I restored the apt sources.list from the previous version, then restarted do-release-update.

  That failed with this error. After that it was a bit of work to get
  things alive again as apt was no longer available.

  ProblemType: Crash
  DistroRelease: Ubuntu 20.10
  Package: ubuntu-release-upgrader-core 1:20.10.12
  ProcVersionSignature: Ubuntu 5.8.0-7618.19~1599238533~20.10~d281510~dev-generic 5.8.4
  Uname: Linux 5.8.0-7618-generic x86_64
  ApportVersion: 2.20.11-0ubuntu49
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  Date: Tue Oct  6 21:31:46 2020
  ExecutablePath: /usr/bin/do-release-upgrade
  InstallationDate: Installed on 2020-09-04 (32 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  InterpreterPath: /usr/bin/python3.8
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python3 /tmp/ubuntu-release-upgrader-xcftkgja/groovy --mode=server --frontend=DistUpgradeViewText --devel-release
  Python3Details: /usr/bin/python3.8, Python 3.8.6, python3-minimal, 3.8.2-0ubuntu2
  PythonArgs: ['/usr/bin/do-release-upgrade', '--mode=server', '--frontend=DistUpgradeViewText', '--devel-release']
  PythonDetails: N/A
  SourcePackage: ubuntu-release-upgrader
  Title: do-release-upgrade crashed with AttributeError in calcDistUpgrade(): 'DistUpgradeController' object has no attribute 'tasks'
  UpgradeStatus: Upgraded to groovy on 2020-10-06 (0 days ago)
  UserGroups: N/A

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