[PyQt] Ubuntu, PyQt/Qt 5.9, QOpenGLShaderProgram "is not linked"

[David Cortesi]

Probably some stupid misconfiguration? But a program that works perfectly
on Win7 and almost perfectly on MacOS, on Ubuntu the window is completely
black and a series of many iterations of the following appear in stderr:

> QOpenGLShaderProgram::uniformLocation(qt_Matrix): shader program is not
linked
> QOpenGLShaderProgram: could not create shader program
> QOpenGLShader: could not create shader
> shader compilation failed: ""

The program uses only standard widgets e.g. QMainWindow, QListView,
QWebEngineView. No explicit refs to QOpenG* anything.

Suggestions welcome...

Dave Cortesi
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