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I had the same issue, when I ran rosrun rqt_graph rqt_graph , then it searches for QtCore in the pyqt and pyside modules. Actually I have already done: sudo apt-get install ros-kinetic-rqt , sudo apt-get install ros-kinetic-rqt-common-plugins and sudo apt-get install ros-kinetic-rqt-graph . So every dependency was already installed. The problem was it anaconda was messing up with my path (as mentioned in the comments). So I commented the export PATH="/home/usp/anaconda2/bin:$PATH" in my ~/.bashrc and everything was running smooth.

I had the same issue, when I ran rosrun rqt_graph rqt_graph , then it searches for QtCore in the pyqt and pyside modules. Actually I have already done: sudo apt-get install ros-kinetic-rqt , sudo apt-get install ros-kinetic-rqt-common-plugins and sudo apt-get install ros-kinetic-rqt-graph . So every dependency was already installed. The problem was it anaconda was messing up with my path (as mentioned in the comments). So I commented the export PATH="/home/usp/anaconda2/bin:$PATH" in my ~/.bashrc and ,then close the terminal & reopen it. And everything was running smooth.

I had the same issue, when I ran rosrun rqt_graph rqt_graph , then it searches for QtCore in the pyqt and pyside modules. Actually I have already done: sudo apt-get install ros-kinetic-rqt , sudo apt-get install ros-kinetic-rqt-common-plugins and sudo apt-get install ros-kinetic-rqt-graph . So every dependency was already installed. The problem was it that anaconda was messing up with my path (as mentioned in the comments). So I commented the export PATH="/home/usp/anaconda2/bin:$PATH" in my ~/.bashrc ,then close the terminal & reopen it. And everything was running smooth.