Seems like it's a Launchpad problem:
In [7]: print filter(lambda a: a.distroseries == lp.distributions['ubuntu'].current_series, lp.packagesets) []
Seems like it's a Launchpad problem:
In [7]: print filter(lambda a: a.distroseries == lp.distribution s['ubuntu' ].current_ series, lp.packagesets)
[]