Update Linux instructions for Debian

Debian requires a second package repository for libgdiplus.

diff --git a/Documentation/building/linux-instructions.md b/Documentation/building/linux-instructions.md
index d228079..9a434a9 100644 (file)
--- a/Documentation/building/linux-instructions.md
+++ b/Documentation/building/linux-instructions.md
@@ -57,7 +57,7 @@ Install Mono
 
 If you don't already have Mono installed on your system, use the [installation instructions](http://www.mono-project.com/docs/getting-started/install/linux/).
 
-At a high level, you do the following:
+For example, for Ubuntu, you do the following:
 
 ```
 ellismg@linux:~$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
@@ -66,6 +66,11 @@ ellismg@linux:~$ sudo apt-get update
 ellismg@linux:~$ sudo apt-get install mono-devel
 ```
 
+Note that Debian requires a second package repository for libgdiplus (this is not applicable to Ubuntu):
+```
+echo "deb http://download.mono-project.com/repo/debian wheezy-libjpeg62-compat main" | sudo tee -a /etc/apt/sources.list.d/mono-xamarin.list
+```
+
 Set the maximum number of file-handles
 --------------------------------------