Merge pull request #827 from dotcloud/dev_environment_update

Update "Setting Up a Dev Environment" doc, with modern golang  PPA and stable lxc kernel

docs/sources/contributing/devenvironment.rst

@@ -5,11 +5,35 @@
 Setting Up a Dev Environment
 ============================
 
-Instructions that have been verified to work on Ubuntu 12.10,
+Instructions that have been verified to work on Ubuntu Precise 12.04 (LTS) (64-bit),
+
+
+Dependencies
+------------
+
+**Linux kernel 3.8**
+
+Due to a bug in LXC docker works best on the 3.8 kernel. Precise comes with a 3.2 kernel, so we need to upgrade it. The kernel we install comes with AUFS built in.
+
 
 .. code-block:: bash
 
-    sudo apt-get -y install lxc wget bsdtar curl golang git
+   # install the backported kernel
+   sudo apt-get update && sudo apt-get install linux-image-generic-lts-raring
+
+   # reboot
+   sudo reboot
+
+
+Installation
+------------
+
+.. code-block:: bash
+		
+    sudo apt-get install python-software-properties
+    sudo add-apt-repository ppa:gophers/go
+    sudo apt-get update
+    sudo apt-get -y install lxc wget bsdtar curl golang-stable git
 
     export GOPATH=~/go/
     export PATH=$GOPATH/bin:$PATH