We don't pipe grep to awk in this house, young man

live-build/functions

@@ -595,7 +595,7 @@ _snap_preseed() {
             local snap_type=$(echo "$snap_info" | awk '/^type:/ { print $2 }')
 
             if [ "$snap_type" != base ]; then
-                local core_snap=$(echo "$snap_info" | grep '^base:' | awk '{print $2}')
+                local core_snap=$(echo "$snap_info" | awk '/^base:/ {print $2}')
 
                 # If snap info does not list a base use 'core'
                 core_snap=${core_snap:-core}