/usr/lib/packagekit/packagekitd:11:gst_caps_unref:GstMatcher::~GstMatcher:AptIntf::providesCodec:backend_what_provides_thread:pk_backend_job_thread_setup

The Ubuntu Error Tracker has been receiving reports about a problem regarding packagekit. This problem was most recently seen with package version 1.1.9-1ubuntu2, the problem page at https://errors.ubuntu.com/problem/77c08379c6eaf0d011144faf5d326bb87da215e7 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.