An example url that gets called (obtained via wireshark)
http://musicsearch.ubuntu.com/v1/tracker?url=http%3A%2F%2Fwww.7digital.de%2Fartists%2Falgernon-cadwallader%2Ffun%3Fpartner%3D983
Although the decoded url seems correct to me:
Happened for me with quantal and a 7zip file
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https://bugs.launchpad.net/bugs/850840
Title:
file-roller crashed with SIGSEGV in g_simple_async_result_complete()
** Attachment added: CoreDump.gz
http://launchpadlibrarian.net/34099200/CoreDump.gz
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/34099201/Dependencies.txt
** Attachment added: Disassembly.txt
http://launchpadlibrarian.net/34099202/Disassembly.txt
** Attachment