diff --git a/elements/apt-sources/README.md b/elements/apt-sources/README.md
new file mode 100644
index 000000000..27b11fd3b
--- /dev/null
+++ b/elements/apt-sources/README.md
@@ -0,0 +1,15 @@
+Override the default sources.list
+
+For Ubuntu OS, if your network connection is slow for the default sources.list,
+you can define DIB_APT_SOURCES with your favorite sources.list to override it,
+before running devtest.sh.
+
+The new sources.list will take effect at build time and run time.
+
+If you want to use this element in tripleo project, set NODE_DIST or
+EXTRA_ELEMENTS / UNDERCLOUD_DIB_EXTRA_ARGS / OVERCLOUD_DIB_EXTRA_ARGS
+to make it take effect at build time and run time.
+
+e.g. before running devtest.sh:
+export DIB_APT_SOURCES=/etc/apt/sources.list
+export NODE_DIST="ubuntu apt-sources"
diff --git a/elements/apt-sources/extra-data.d/99-override-default-apt-sources b/elements/apt-sources/extra-data.d/99-override-default-apt-sources
new file mode 100755
index 000000000..fce7150bc
--- /dev/null
+++ b/elements/apt-sources/extra-data.d/99-override-default-apt-sources
@@ -0,0 +1,25 @@
+#!/bin/bash
+# Override the default /etc/apt/sources.list with $DIB_APT_SOURCES
+
+set -e
+
+# get the cloudimg version
+source $TMP_MOUNT_PATH/etc/lsb-release
+echo "Current cloudimg codename is: $DISTRIB_DESCRIPTION $DISTRIB_CODENAME"
+
+# exit directly if DIB_APT_SOURCES is not defined properly
+if [ -z "$DIB_APT_SOURCES" ] ; then
+    echo "DIB_APT_SOURCES must be set to the location of a sources.list file you wish to use"
+    exit 1
+elif [ ! -f "$DIB_APT_SOURCES" -o ! -s "$DIB_APT_SOURCES" ] ; then
+    echo "$DIB_APT_SOURCES  is not a valid sources.list file."
+    echo "You should assign proper sources.list file in DIB_APT_SOURCES"
+    exit 1
+fi
+
+DIB_APT_SOURCES=`readlink -f $DIB_APT_SOURCES`
+
+# copy the sources.list to cloudimg
+pushd $TMP_MOUNT_PATH/etc/apt/
+sudo cp -f $DIB_APT_SOURCES sources.list
+popd