Fix package manager detection

scripts/linux_build/linux_native_build.bash

 #!/bin/bash
-
 do_build() {
     # TODO: build inside a chroot?
     cd "${pkgname}" || exit 1
@@ -32,7 +31,8 @@ then
         fi
     else
         eval "$(</etc/lsb-release)"
-        echo "Distribution \'${DISTRIB_DESCRIPTION}\' is not currently supported by the native build script. Merge requests are welcome."
+        echo "Distribution '${DISTRIB_DESCRIPTION}' is not currently supported by the native build script. Merge requests are welcome."
+        exit 2
     fi
 fi
 do_build;