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I just solved the problem with a hackish solution. Indigo apparently does not have data_plot installed for some strange reason. The solution I found was to take data_plot from Hydro and manually install into Indigo.

1. Find Indigo's rqt_plot (/opt/ros/indigo/lib/python2.7/dist-packages/rqt_plot)
2. Create a new folder called data_plot
3. Download and unzip the rqt_common_plugins file from Hydro (h ttps://github.com/ros-visualization/rqt_common_plugins)
4. Locate the Hydro data_plot folder from the rqt_common_plugins download (/rqt_common_plugins-groovy-devel/rqt_plot/src/rqt_plot) there should be 4 files inside __ init__.py, mat_data_plot.py, pytqtgraph_data_plot.py, and qwt_data_plot.py.
5. Move the 4 Hydro data_plot files to the Indigo data_plot folder you created earlier
6. Run rqt_plot

Note: you will have to use sudo to move the files to Indigo.

I just solved the problem with a hackish solution. Indigo apparently does not have data_plot installed for some strange reason. The solution I found was to take data_plot from Hydro and manually install into Indigo.

1. Find Indigo's rqt_plot (/opt/ros/indigo/lib/python2.7/dist-packages/rqt_plot)
2. Create a new folder called data_plot
3. Download and unzip the rqt_common_plugins file from Hydro (h ttps://github.com/ros-visualization/rqt_common_plugins)
4. Locate the Hydro data_plot folder from the rqt_common_plugins download (/rqt_common_plugins-groovy-devel/rqt_plot/src/rqt_plot) there should be 4 files inside __ init__.py, mat_data_plot.py, pytqtgraph_data_plot.py, and qwt_data_plot.py.
5. Move the 4 Hydro data_plot files to the Indigo data_plot folder you created earlier
6. Run rqt_plot

Note: you will have to use sudo to move the files to Indigo.