grep -q 'grml-live.*main' "$SOURCES_LIST_FILE" || \
grep grml-stable "$SOURCES_LIST_FILE" | \
sed 's/grml-stable/grml-live/' >> "$SOURCES_LIST_FILE"
grep -q 'grml-live.*main' "$SOURCES_LIST_FILE" || \
grep grml-stable "$SOURCES_LIST_FILE" | \
sed 's/grml-stable/grml-live/' >> "$SOURCES_LIST_FILE"