從mono的官網上查，debian的步驟寫得太亂了。其實總結起來，就是這麼幾步：

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

就安裝好了。

檢查也很簡單：

1 mono -V

返回結果如下：

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