[Bug 1856862] Re: Upgrade to focal fails with AttributeError: 'NoneType' object has no attribute 'section' in in DistUpgradeCache.py line 942 when default snap packages are not installed

[Jean-Baptiste Lallement]

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Triaged => In Progress

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https://bugs.launchpad.net/bugs/1856862

Title:
  Upgrade to focal fails with AttributeError: 'NoneType' object has no
  attribute 'section' in  in DistUpgradeCache.py line 942 when default
  snap packages are not installed

Status in ubuntu-release-upgrader package in Ubuntu:
  In Progress

Bug description:
  TESTCASE
  1. Branch auto-upgrade-testing and the upgrade profiles and run the command:

  sudo python3 -m upgrade_testing.command_line --adt-args -d -s -c
  <<PATH_TO_PROFILES>>/ubuntu-eoan-focal-desktop-amd64_qemu.yaml
  --provision --results-dir <<RESULT_DIR>>

  TESTCASE 2
  1. Install eoan
  2. Remove all the snap pacakges but core and core18
  3. run in a terminal: do-release-upgrade -d

  Error from main.log
  2019-12-18 14:57:50,363 DEBUG Start checking for obsolete pkgs
  2019-12-18 14:57:50,524 ERROR got exception '<class 'AttributeError'>': 'NoneType' object has no attribute 'section'
  NoneType: None
  2019-12-18 14:57:50,532 ERROR not handled exception:
  Traceback (most recent call last):
    File "/tmp/ubuntu-release-upgrader-oq9n6a1n/focal", line 8, in <module>
      sys.exit(main())
    File "/tmp/ubuntu-release-upgrader-oq9n6a1n/DistUpgrade/DistUpgradeMain.py", line 238, in main
      if app.run():
    File "/tmp/ubuntu-release-upgrader-oq9n6a1n/DistUpgrade/DistUpgradeController.py", line 2082, in run
      return self.fullUpgrade()
    File "/tmp/ubuntu-release-upgrader-oq9n6a1n/DistUpgrade/DistUpgradeController.py", line 2059, in fullUpgrade
      self.doPostUpgrade()
    File "/tmp/ubuntu-release-upgrader-oq9n6a1n/DistUpgrade/DistUpgradeController.py", line 1485, in doPostUpgrade
      if not self.cache.tryMarkObsoleteForRemoval(pkgname, remove_candidates, self.foreign_pkgs):
    File "/tmp/ubuntu-release-upgrader-oq9n6a1n/DistUpgrade/DistUpgradeCache.py", line 241, in wrapper
      res = f(*args, **kwargs)
    File "/tmp/ubuntu-release-upgrader-oq9n6a1n/DistUpgrade/DistUpgradeCache.py", line 942, in tryMarkObsoleteForRemoval
      if pkgname in self and self[pkgname].installed.section == section:
  AttributeError: 'NoneType' object has no attribute 'section'

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.7
  ProcVersionSignature: User Name 5.3.0-24.26-generic 5.3.10
  Uname: Linux 5.3.0-24-generic x86_64
  ApportVersion: 2.20.11-0ubuntu14
  Architecture: amd64
  CrashDB: ubuntu
  Date: Wed Dec 18 16:17:08 2019
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2019-12-18 (0 days ago)
  VarLogDistupgradeAptclonesystemstate.tar.gz:
   Error: command ['pkexec', 'cat', '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'] failed with exit code 127: polkit-agent-helper-1: error response to PolicyKit daemon: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: No session for cookie
   Error executing command as another user: Not authorized

   This incident has been reported.

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