从mono的官网上查，debian的步骤写得太乱了。其实总结起来，就是这么几步：
1 apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF 2 3 echo "deb http://download.mono-project.com/repo/debian wheezy main" | tee /etc/apt/sources.list.d/mono-xamarin.list 4 echo "deb http://download.mono-project.com/repo/debian wheezy-apache24-compat main" | tee -a /etc/apt/sources.list.d/mono-xamarin.list 5 echo "deb http://download.mono-project.com/repo/debian wheezy-libjpeg62-compat main" | tee -a /etc/apt/sources.list.d/mono-xamarin.list 6 7 apt-get update 8 9 apt-get install mono-devel mono-complete referenceassemblies-pcl ca-certificates-mono
就安装好了。
检查也很简单：
1 mono -V
返回结果如下：
Mono JIT compiler version 4.2.2 (Stable 4.2.2.30/996df3c Mon Feb 15 17:30:30 UTC 2016)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
TLS: __thread
SIGSEGV: altstack
Notifications: epoll
Architecture: amd64
Disabled: none
Misc: softdebug
LLVM: supported, not enabled.
GC: sgen