Ubuntu 14.04安装Mono教程，没有以前那么麻烦了，Mono官方给出的简单安装方法。

Mono安装步骤：

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
apt-get update
apt-get install mono-complete