Can't run all tests xvfb-run in Karmic

it hangs for me reproducibly on testPPAUploadResultingInNoBuilds:

$ xvfb-run bin/test -t testPPAUploadResultingInNoBuilds
Running canonical.testing.layers.LaunchpadZopelessLayer tests:
  Set up canonical.testing.layers.BaseLayer in 0.025 seconds.
  Set up canonical.testing.layers.ZopelessLayer in 7.735 seconds.
  Set up canonical.testing.layers.DatabaseLayer in 0.866 seconds.
  Set up canonical.testing.layers.LibrarianLayer in 8.597 seconds.
  Set up canonical.testing.layers.MemcachedLayer in 0.135 seconds.
  Set up canonical.testing.layers.LaunchpadLayer in 0.000 seconds.
  Set up canonical.testing.layers.LaunchpadScriptLayer in 0.008 seconds.
  Set up canonical.testing.layers.LaunchpadZopelessLayer in 0.000 seconds.