Error in Linux: "QGtkStyle could not resolve GTK"

When using matplotlib or other graphics libraries in Linux, you may see the error "QGtkStyle could not resolve GTK. Make sure you have installed the proper libraries."

To resolve this issue, try setting the following environment variable (either in your bash shell, or, more persistently, in your .bashrc or other configuration file):

export QT_STYLE_OVERRIDE=gtk2

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