Retry apt-get update on failure -- rabbitmq's servers are failing a bunch
diff --git a/.travis/install.sh b/.travis/install.sh
index d42944d..18deb8e 100755
--- a/.travis/install.sh
+++ b/.travis/install.sh
@@ -67,7 +67,8 @@
         sudo add-apt-repository -y "deb http://archive.ubuntu.com/ubuntu/ lucid main"
     fi
 
-    sudo apt-get -y update
+    # Retry `update` on failure, some of the servers aren't super reliable.
+    sudo apt-get -y update || sudo apt-get -y update
 
     if [[ "${OPENSSL}" == "0.9.8" ]]; then
         sudo apt-get install -y --force-yes libssl-dev/lucid