No, it will be the other way, unless Ubuntu and Webmin has changed a lot during the last time.
Webmin will normally require a lot of manual configuration before it is working in any reasonable way, so for practical reasons it is not much usable. If you can do the then manually configuration that Webmin actuelly will require, you actually do not need Webmin.
SME server runs directely out of the box so it will be much more easy and much more fast to set up. It will also be much more safe because the new beginners fault that normally will be there during manual configuration will be eleminated.
Please correct me anyone, if my knowledge about Webmnin should not be updated, or if it is possible to set up a LAMP server based on Ubuntu/Webmin that will work "out of the box". I think that for practical reasons this will not be working very well.
Am I incorrect about this ? (It is difficult to find time to test all new versions of everything, so I would be interested in an advice or a correction.)
My impression of Webmin is that it is more a set of "bolts and tools" to develop your own admin system rather than a admin system that works out of the box. (Does anyone has other experiences ??)