diff --git a/Dockerfile b/Dockerfile
index 4a3722a..eca97ee 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -27,23 +27,19 @@
         chown -Rf $USERNAME.$USERNAME /home/$USERNAME
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
-        sudo \
-        less \
-        tmux \
+        sudo less tmux \
         bash-completion \
         command-not-found \
         software-properties-common \
-        xsel \
-        xdg-user-dirs \
-        python \
-        python-pip \
+        xsel xdg-user-dirs \
+        python python-pip \
         python-dev \
         python-protobuf \
         python-pexpect \
         pcl-tools \
         openssh-server \
         locales && \
-    apt-get clean && rm -rf /var/lib/apt/lists/* && \
+    apt-get autoclean -y && apt-get autocremove -y  && rm -rf /var/lib/apt/lists/* && \
     locale-gen en_US.UTF-8
 
 RUN pip install --upgrade pip setuptools 
@@ -60,7 +56,7 @@
 			\"api_version\" : \"${VULKAN_API_VERSION}\"\
 		}\
 	}" > /etc/vulkan/icd.d/nvidia_icd.json && \
-	apt-get clean && rm -rf /var/lib/apt/lists/*
+    apt-get autoclean -y && apt-get autocremove -y  && rm -rf /var/lib/apt/lists/* 
 
 # Error constructing proxy for org.gnome.Terminal:/org/gnome/Terminal/Factory0: Failed to execute child process dbus-launch (No such file or directory)
 # fix by setting LANG https://askubuntu.com/questions/608330/problem-with-gnome-terminal-on-gnome-3-12-2
@@ -90,7 +86,7 @@
         pkg-config \
         libelf-dev \
         gnupg patch xinit && \
-     apt-get clean && rm -rf /var/lib/apt/lists/*
+     apt-get autoclean -y && apt-get autocremove -y  && rm -rf /var/lib/apt/lists/* 
 
 #        libc6:i386 \
 # (1-2) Install xorg server and xinit BEFORE INSTALLING NVIDIA DRIVER.
@@ -110,7 +106,7 @@
     apt-key add /var/cuda-repo-ubuntu1804-11-6-local/7fa2af80.pub
 RUN apt-get update && apt-get install -y --no-install-recommends \
     cuda-drivers && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
+    apt-get autoclean -y && apt-get autocremove -y  && rm -rf /var/lib/apt/lists/* 
 
 
 # (2) Configurate Xorg
@@ -127,7 +123,7 @@
     mesa-utils lxterminal gnome-tweak-tool x11-apps \
     automake autoconf libssl-dev xorg-dev libvncserver-dev \
     xdg-user-dirs xdg-utils && \
-    apt-get clean && rm -rf /var/lib/apt/lists/* && \
+    apt-get autoclean -y && apt-get autocremove -y  && rm -rf /var/lib/apt/lists/* && \
     git clone -b 0.9.16 https://github.com/LibVNC/x11vnc.git && \
     cd x11vnc && \
     ./autogen.sh && \
@@ -138,7 +134,7 @@
 # vulkan-utils includes vulkan-smoketest, benchmark software of vulkan API
 RUN apt-get update && apt-get install -y --no-install-recommends \
     vulkan-utils firefox openbox menu alsa pulseaudio libgtk2.0-0 && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
+    apt-get autoclean -y && apt-get autocremove -y  && rm -rf /var/lib/apt/lists/* 
 
 # novnc
 # download websockify as well
@@ -153,7 +149,7 @@
 # related? https://github.com/Microsoft/WSL/issues/2016
 RUN apt-get update && apt-get install -y --no-install-recommends \
     dbus-x11 libdbus-c++-1-0v5 && \ 
-    apt-get clean && rm -rf /var/lib/apt/lists/*
+    apt-get autoclean -y && apt-get autocremove -y  && rm -rf /var/lib/apt/lists/* 
 
 RUN echo "alias m='cd /home/$USERNAME ; su $USERNAME'" >> /home/$USERNAME/.bashrc 
 
@@ -166,7 +162,7 @@
     python-rosinstall \
     python-rosinstall-generator \
     python-wstool && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
+    apt-get autoclean -y && apt-get autocremove -y  && rm -rf /var/lib/apt/lists/* 
 
 # addtional ROS package
 RUN apt-get update && apt-get install -y --no-install-recommends \
@@ -176,7 +172,7 @@
     python3-numpy \
     libomp-dev \
     libomp5 && \
-    apt-get clean && rm -rf /var/lib/apt/lists/* 
+    apt-get autoclean -y && apt-get autocremove -y  && rm -rf /var/lib/apt/lists/* 
 
 RUN pip install --upgrade setuptools wheel && \
     pip install \