Good catch! I'll change the bugs against those two packages.
** Changed in: quodlibet (Ubuntu)
Sourcepackagename: quodlibet => gst-python
Status: Needs Info => Confirmed
** Also affects: gst0.10-python (Ubuntu)
Importance: Untriaged
Status: Unconfirmed
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python-gst conflicts with python-gst0.10
https://launchpad.net/bugs/59755