Comment 2 for bug 86379

seems krb5-config is needed too.
I've got this without it:
/usr/lib/python2.5/site-packages/apt/__init__.py:18: FutureWarning: apt API not stable yet
  warnings.warn("apt API not stable yet", FutureWarning)
Traceback (most recent call last):
  File "/usr/bin/authtool-gtk", line 552, in <module>
    app = AuthtoolGTK()
  File "/usr/bin/authtool-gtk", line 41, in __init__
    self.authtools = Authtools()
  File "/var/lib/python-support/python2.5/AuthTool/authtools.py", line 264, in __init__
    self.method_cfgs[method] = obj(self.cfg)
  File "/usr/share/authtool/auth_methods/kerberos/kerberos.py", line 50, in __init__
    default_realm = self.db.get('krb5-config/default_realm')
  File "/var/lib/python-support/python2.5/AuthTool/authtools.py", line 192, in get
    return self.db.get(item)
  File "/usr/lib/python2.5/site-packages/debconf.py", line 60, in <lambda>
    lambda *args, **kw: self.command(command, *args, **kw))
  File "/usr/lib/python2.5/site-packages/debconf.py", line 96, in command
    raise DebconfError(status, data)
debconf.DebconfError: (10, "krb5-config/default_realm doesn't exist")