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E: Unable to locate package ros-kinect-rqt

Wrong prefix. I think you mean ros-kinetic.

ModuleNotFoundError: No module named 'pydot'

rqt_graph depends on qt_dotgraph, which depends on python-pydot. So by the official, formal way of installation like the following, it should be installed.

$ sudo apt-get install ros-kinetic-rqt-graph
[sudo] password for n130s: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  python-pydot ros-kinetic-qt-dotgraph
The following NEW packages will be installed:
  python-pydot ros-kinetic-qt-dotgraph ros-kinetic-rqt-graph
0 upgraded, 3 newly installed, 0 to remove and 9 not upgraded.
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