在Ubuntu上安装Mono
执行以下代码授权注冊repo源并更新软件列表：
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list
sudo apt-get update
安装Mono：
sudo apt-get install mono-complete
安装Monodevelop IDE软件：
sudo apt-get install monodevelop
參考：
http://www.mono-project.com/docs/getting-started/install/linux/
http://www.monodevelop.com/download/linux/