I cannot get any Look and Feel to work

[Larry]

I'm using IzPack 5.1.3. None of the <laf> variations seem to work. My template contains the following:

<guiprefs>
    <laf name="metouia">
        <os family="unix" />
        <os family="windows" />
    </laf>
</guiprefs>

On Windows 10 as well as Ubuntu 18.04.2, using "kunststoff" and "looks" both produce the same look and feel, regardless of the variant used. They do produce a different look and feel than when I do not specify any <laf> element.

The maven-plugin generates a  "Unrecognized Look and Feel: metouia" for each of the following names:

• windows
• aqua
• metal

"substance" causes "SEVERE: com.izforge.izpack.api.exception.IzPackException: java.lang.reflect.InvocationTargetException" at run-time.

What am I doing wrong?

Larry