rqt rqt_graph rqt_plot does't work Segmentation fault (core dumped)

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I had the same problem. When I checked the Ubuntu crash report I realized that the error was coming from Qt library. I had a software package which was referencing QT libs from a different path. Once I setup the environment variable LD_LIBRARY_PATH=<qt home="" directory="">/5.7/gcc_64/lib I was able to run rqt without segfault. Hope this helps.

I have the same issue. And I tried this it works on my system (Ubuntu 16.04.3 LTS):

1. Remove python-sip

   sudo apt remove python-sip

2. Reinstall the ROS (This will just install the packages related to pyqt etc., which is just 41 MB). I installed kinetic so the code is

   sudo apt-get install ros-kinetic-desktop-full

3. At the end update and upgrade the system
   sudo apt-get update
sudo apt-get upgrade