[Bug 1805475] Re: ubuntu-release-upgrader crashed with AttributeError: '_NamespacePath' object has no attribute 'sort'

[Brian Murray]

The traceback happens when importing computer janitor code which no
longer need.

Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-lj_9ymon/bionic", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-lj_9ymon/DistUpgrade/DistUpgradeMain.py", line 224, in main
    from .DistUpgradeController import DistUpgradeController
  File "/tmp/ubuntu-release-upgrader-lj_9ymon/DistUpgrade/DistUpgradeController.py", line 52, in <module>
    from .DistUpgradeQuirks import DistUpgradeQuirks
  File "/tmp/ubuntu-release-upgrader-lj_9ymon/DistUpgrade/DistUpgradeQuirks.py", line 36, in <module>
    from janitor.plugincore.manager import PluginManager
  File "/tmp/ubuntu-release-upgrader-lj_9ymon/janitor/__init__.py", line 20, in <module>
    import pkg_resources
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2927, in <module>
    @_call_aside
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2913, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2952, in _initialize_master_working_set
    add_activation_listener(lambda dist: dist.activate())
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 956, in subscribe
    callback(dist)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2952, in <lambda>
    add_activation_listener(lambda dist: dist.activate())
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2515, in activate
    declare_namespace(pkg)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2097, in declare_namespace
    _handle_ns(packageName, path_item)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2047, in _handle_ns
    _rebuild_mod_path(path, packageName, module)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2066, in _rebuild_mod_path
    orig_path.sort(key=position_in_sys_path)
AttributeError: '_NamespacePath' object has no attribute 'sort'

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

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => Medium

** Changed in: ubuntu-release-upgrader (Ubuntu)
     Assignee: (unassigned) => Brian Murray (brian-murray)

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https://bugs.launchpad.net/bugs/1805475

Title:
  ubuntu-release-upgrader crashed with AttributeError: '_NamespacePath'
  object has no attribute 'sort'

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

Bug description:
  The Ubuntu Error Tracker has been receiving reports about a problem regarding ubuntu-release-upgrader.  This problem was most recently seen with package version 1:18.04.29, the problem page at https://errors.ubuntu.com/problem/2abac1a6a3ae5c39236650a7254635c02ae02a69 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
  If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.

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