The ASP.NET development environment on Ubuntu Linux is called XSP. This is a simple webserver written in C# that can be used for either ASP.NET 1.0 or 2.0 applications. You can install both environments side by side if need be.
XSP is actually the cassini of the Linux world, Its not meant for production. There is a module for apache called "mod_mono" that you should use instead. I wrote a howto on getting apache/mod_mono up for SuSE here: http://blog.sontek.net/archive/2006/11/05/2.aspx and there is an Ubuntu one here: https://help.ubuntu.com/community/ModMono
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