diff --git a/marshall/installers/000_apt.sh b/marshall/installers/000_apt.sh
index 249a480..8e6eaac 100755
--- a/marshall/installers/000_apt.sh
+++ b/marshall/installers/000_apt.sh
@@ -11,10 +11,13 @@ echo "force-unsafe-io" > /etc/dpkg/dpkg.cfg.d/force-unsafe-io
 ) \
   | sed '/^#/d' \
   | sed '/^$/d' \
-  | uniq \
   > /etc/apt/sources.list.d/ubuntu.list
 rm /etc/apt/sources.list; touch /etc/apt/sources.list;
 
+# Remove duplicate sources
+sort /etc/apt/sources.list.d/ubuntu.list | uniq > /etc/apt/sources.list.d/ubuntu.list.uniq
+mv /etc/apt/sources.list.d/ubuntu.list.uniq /etc/apt/sources.list.d/ubuntu.list
+
 # Update apt repos
 apt-get -qq update