AttributeError: 'module' object has no attribute 'add_metaclass'

[Adnane Belmadiaf]

Bazaar unsable after the upgrade 14.04 to 16.04
$ bzr commit
Committing to: /home/daker/Projects/fix.1664758/
modified src/imports/Components/1.3/ListItemPopover.qml
bzr: ERROR: exceptions.AttributeError: 'module' object has no attribute 'add_metaclass'

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 930, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1121, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 673, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 697, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 136, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 166, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 3687, in run
    lossy=lossy)
  File "/usr/lib/python2.7/dist-packages/bzrlib/decorators.py", line 218, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/workingtree_4.py", line 218, in commit
    result = WorkingTree.commit(self, message, revprops, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/decorators.py", line 218, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/mutabletree.py", line 211, in commit
    *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commit.py", line 290, in commit
    lossy=lossy)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 132, in run
    self.cleanups, self.func, self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 166, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commit.py", line 443, in _commit
    message = message_callback(self)
  File "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 3660, in get_message
    my_message = set_commit_message(commit_obj)
  File "/usr/lib/python2.7/dist-packages/bzrlib/msgeditor.py", line 335, in set_commit_message
    start_message = hook(commit, start_message)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/builddeb/__init__.py", line 180, in debian_changelog_commit
    from bzrlib.plugins.builddeb.util import (
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/builddeb/util.py", line 35, in <module>
    from debian import deb822
  File "/usr/lib/python2.7/dist-packages/debian/deb822.py", line 1481, in <module>
    @six.add_metaclass(_ClassInitMeta)
AttributeError: 'module' object has no attribute 'add_metaclass'

[Vincent Ladeuil (vila)]

This is a builddeb issue, redirecting.
Short term: disable the plugin.