-deb http://ftp1.us.debian.org/debian unstable main contrib non-free
-deb http://non-us.debian.org/debian-non-US unstable non-US/main non-US/contrib non-US/non-free
+# CDROMs are managed through the apt-cdrom tool.
+deb http://us.archive.ubuntu.com/ubuntu dapper main restricted
+deb-src http://us.archive.ubuntu.com/ubuntu dapper main restricted
+
+deb http://security.ubuntu.com/ubuntu dapper-security main restricted
+deb-src http://security.ubuntu.com/ubuntu dapper-security main restricted
+
+deb http://us.archive.ubuntu.com/ubuntu dapper-updates main restricted
+deb-src http://us.archive.ubuntu.com/ubuntu dapper-updates main restricted