Update: since Hiri version 1.2.0.0 this issues has been fixed.
On some Linux distros, on machines with nVidia graphics cards, you may experience a problem launching Hiri. The output looks like this:
[MainProcess Dummy-3 ] QML 2017-04-18 13:31:38,202 qml - QOpenGLShaderProgram::uniformLocation(matrix): shader program is not linked
[MainProcess Dummy-3 ] QML 2017-04-18 13:31:38,202 qml - QOpenGLShaderProgram::uniformLocation(opacity): shader program is not linked
[MainProcess Dummy-3 ] QML 2017-04-18 13:31:38,202 qml - QOpenGLShaderProgram::uniformLocation(pixelSize): shader program is not linked
[MainProcess Dummy-3 ] QML 2017-04-18 13:31:38,203 qml - QOpenGLShaderProgram: could not create shader program
This is a well-known bug with nVidia drivers on Ubuntu, and can be resolved by following the instructions given here: https://github.com/Ultimaker/Cura/pull/131#issuecomment-176088664
The Ubuntu bug report which gives more detail and alternative fixes is here: https://bugs.launchpad.net/ubuntu/+source/python-qt4/+bug/941826