switch back to ubuntu:14.04.2 image
diff --git a/containers/xos/Dockerfile b/containers/xos/Dockerfile
index 0fd7565..7e9db23 100644
--- a/containers/xos/Dockerfile
+++ b/containers/xos/Dockerfile
@@ -1,4 +1,4 @@
-FROM       python:2.7.11
+FROM       ubuntu:14.04.2
 
 # XXX Workaround for docker bug:
 # https://github.com/docker/docker/issues/6345