diff --git a/files/sources.list b/files/sources.list
index 96fab5f..a58eca3 100644
--- a/files/sources.list
+++ b/files/sources.list
@@ -1,9 +1,9 @@
-deb http://us.archive.ubuntu.com/ubuntu/ natty main restricted
-deb http://us.archive.ubuntu.com/ubuntu/ natty-updates main restricted
-deb http://us.archive.ubuntu.com/ubuntu/ natty universe
-deb http://us.archive.ubuntu.com/ubuntu/ natty-updates universe
-deb http://us.archive.ubuntu.com/ubuntu/ natty multiverse
-deb http://us.archive.ubuntu.com/ubuntu/ natty-updates multiverse
-deb http://security.ubuntu.com/ubuntu natty-security main restricted
-deb http://security.ubuntu.com/ubuntu natty-security universe
-deb http://security.ubuntu.com/ubuntu natty-security multiverse
+deb http://us.archive.ubuntu.com/ubuntu/ %DIST% main restricted
+deb http://us.archive.ubuntu.com/ubuntu/ %DIST%-updates main restricted
+deb http://us.archive.ubuntu.com/ubuntu/ %DIST% universe
+deb http://us.archive.ubuntu.com/ubuntu/ %DIST%-updates universe
+deb http://us.archive.ubuntu.com/ubuntu/ %DIST% multiverse
+deb http://us.archive.ubuntu.com/ubuntu/ %DIST%-updates multiverse
+deb http://security.ubuntu.com/ubuntu %DIST%-security main restricted
+deb http://security.ubuntu.com/ubuntu %DIST%-security universe
+deb http://security.ubuntu.com/ubuntu %DIST%-security multiverse