Hi,
It seems as though the PPA builds on Launchpad are a bit unstable at the moment. I've finally retried the builds such that all of todays builds completed successfully.
I am not sure what is happening, but it's not in duplicity. It was happening in both 32-bit and 64-bit builds on every package. Resubmitting the entire build set would just change which builds failed. Very odd.
I'll be checking it daily.
...Thanks,
...Ken