diff --git a/Dockerfile b/Dockerfile
index 1b3178a..5c14cb4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -95,7 +95,6 @@
 # if you need full ubuntu desktop environment, the line below should be added.
         # ubuntu-desktop \
 RUN apt-get update && apt-get install -y \
-        ubuntu-desktop \
         xinit && \
     rm -rf /var/lib/apt/lists/*
 
@@ -172,7 +171,7 @@
 
 # for test
 RUN apt-get update && apt-get install -y --no-install-recommends \
-        firefox openbox && \
+        firefox openbox menu && \
     rm -rf /var/lib/apt/lists/*
 
 # sound driver and GTK library