if ! grep -q backports /etc/apt/sources.list.d/backports.list 2>/dev/null ; then
cat >> /etc/apt/sources.list.d/backports.list << EOF
# debian backports: ${RELEASE}-backports repository:
if ! grep -q backports /etc/apt/sources.list.d/backports.list 2>/dev/null ; then
cat >> /etc/apt/sources.list.d/backports.list << EOF
# debian backports: ${RELEASE}-backports repository: