--- 20-setup-apt.old    2009-09-20 19:43:37.000000000 -0400
+++ 20-setup-apt        2009-09-20 19:56:00.000000000 -0400
@@ -78,7 +78,7 @@
 #
 #  If the host system has security support then enable that here too.
 #
-if ( grep ^deb.*security.debian.org /etc/apt/sources.list >/dev/null 2>/dev/null ) ; then
+if ( grep -E '^deb.*security\.(debian\.org|ubuntu\.com)' /etc/apt/sources.list >/dev/null 2>/dev/null ) ; then

     cat <<E_O_APT >> ${prefix}/etc/apt/sources.list
 #