How to install mono in Linux server?
On Ubuntu, Mono can be installed from the repositories by installing the mono-complete package. Other distributions should also have packages in their repositories. Using the distribution's package manager is the preferred method of installation.
To do the install in Ubuntu:
sudo apt-get install mono-complete
Here are instructions for Debian.
See this page for more information.
In a yum/rpm based distro (Fedora), use
yum install mono-complete