gnome-control-center: symbol lookup error: /lib/x86_64-linux-gnu/libgstvideo-1.0.so.0: undefined symbol: gst_aggregator_simple_get_next_time
Solution 1:
Okay, I finally found it. GStremer had installed some libs under /usr/local/lib, specifically libgstbase-1.0.so, libgstbase-1.0.so.0, libgstbase-1.0.so.0.1405.0, libgstreamer-1.0.la, libgstreamer-1.0.so, libgstreamer-1.0.so.0 and libgstreamer-1.0.so.0.1405.0. After I removed them gnome-control-center worked fine. I hope nothing else has broken, I'll edit if I find something else out.