请教如何在Debian Linux上安装Mono？

大家好
我想请教要如何才能够在Debian上面安装Mono？
因为我想要使用LinkTalk，但我用Debian Linux
我是下载mono与xsp与mod_mono，然后把mono与xsp
./configure --prefix=/usr
make
make install
然后mod_mono
./configure --with-apxs=/usr/local/apache2/bin/apxs
make
make install
之后在httpd.conf加上
LoadModule mono_module usr/lib/apache2/modules/mod_mono.so
Include /etc/apache2/mod_mono.conf

default里面加上
Alias /dotnet "/var/www/dotnet"
   
AddMonoApplications dotnet "/dotnet:/var/www/dotnet"
   
     MonoServerPath dotnet /usr/bin/mod-mono-server2
     MonoPath dotnet /usr/lib/mono/2.0:/usr/lib:/usr/lib/mono/2.0
   
<Directory "/var/www/dotnet">
     MonoSetServerAlias dotnet
     SetHandler mono
</Directory>
结果把linktalk的net.aspx放入dotnet资料夹里面
浏览器输入http://localhost/dotnet/net.aspx
结果出现503
Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

不管怎么搞都弄不成功，可否请教有成功的网友教学一下，感谢

支持。学习了