参考介绍 http://www.monodevelop.com/download/linux/
首先，Add the Mono Project GPG signing key
sudo apt-key adv --keyserver pgp.mit.edu --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
其次，Add the package repository
echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list
然后开始安装
sudo apt-get install monodevelop
sudo apt-get install monodevelop-nunit
sudo apt-get install monodevelop-versioncontrol
sudo apt-get install monodevelop-database