Here's the error:

Failed to install script : Download of http://jaist.dl.sourceforge.net/sourceforge/nucleuscms/nucleus3.24.zip failed : Failed to connect to jaist.dl.sourceforge.net:80 : Interrupted system call

Looks like this download location doesn't exist. I'm assuming this can be changed within the nucleus.pl file found under /user/libexec/webmin/virtual-server/scripts/, but I'm not sure where to do this. The only URL I can find was on line 119 but it points to "http://osdn.dl.sourceforge.net/sourceforge/nucleuscms/nucleus$ver.zip".

Anyone have any ideas?