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'

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