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It's because the recent faulty release. We're working on it, and looks like the fix is ready to be released into public (although it might take several days. I'm not sure when is the next release date).

Quick workaround if you don't use rqt with kobuki, uninstall kobuki pkgs should work (so far I've only seen this issue to happen when kobukis are installed). But just to be clear, the root cause is in qt_gui_core metapackage and kobuki is not doing any harm.

Sorry for any inconvenience.