Add note for Ubuntu users.

README.md

@@ -12,7 +12,11 @@ See [API.md](https://github.com/Neopallium/lua-zmq/blob/master/API.md) and
 Requirements
 ============
 
-* ZeroMQ version 2.1.x.  Might work with some 2.0.x versions (2.0.6 and lower are not supported).
+* ZeroMQ version 2.1.x.
+* Might work with some 2.0.x versions (2.0.6 and lower are not supported).
+
+For Ubuntu 10.10 users:
+* The version of ZeroMQ (2.0.6beta) that comes with Ubuntu 10.10 will not work with these bindings.  Please upgrade to [version 2.1](http://fanf42.blogspot.com/2011/02/installing-zeromq-and-java-bindings-on.html).
 
 Installation
 ============