Comment 2 for bug 612391

I believe this occurs because you cannot upload to a released series.

I think retargeting all such uploads to $1-proposed makes a lot of sense given the rest of the modelling around releases for Ubuntu. It would be a reasonable stop-gap at least.

I think you are able to script such a thing via the API, so am going to mark this bug invalid for now; if you can't, please reopen.