Creating dir for gradio config
diff --git a/dockerfiles/Ubuntu15.docker b/dockerfiles/Ubuntu15.docker
index 4f686b6..291af61 100644
--- a/dockerfiles/Ubuntu15.docker
+++ b/dockerfiles/Ubuntu15.docker
@@ -64,6 +64,7 @@
 
 COPY ./ /src/
 
+RUN mkdir /root/.gnuradio/
 RUN echo "[grc]\nlocal_blocks_path=/usr/local/share/gnuradio/grc/blocks" > \
     /root/.gnuradio/config.conf