Update Dockerfile

Author: avikdatta

python_docker_for_ubuntu/Dockerfile

@@ -60,18 +60,18 @@ RUN useradd -m -s /bin/bash -N -u $NB_UID $NB_USER \
  && groupadd $NB_GROUP \
  && usermod -a -G $NB_GROUP $NB_USER
 
+USER $NB_USER
+WORKDIR /home/$NB_USER
+
 RUN echo "install.packages(c('repr', 'IRdisplay', 'evaluate', 'crayon', 'pbdZMQ', 'devtools', 'uuid', 'digest'))" > /home/$NB_USER/install.R \
  && echo "devtools::install_github('IRkernel/IRkernel')" >> /home/$NB_USER/install.R \
- && echo "IRkernel::installspec(user = FALSE)" >> /home/$NB_USER/install.R 
+ && echo "IRkernel::installspec()" >> /home/$NB_USER/install.R 
 
 ENV R_LIBS_USER /home/$NB_USER/rlib
 
 RUN mkdir -p /home/$NB_USER/rlib
 
 RUN R CMD BATCH --no-save /home/$NB_USER/install.R
- 
-USER $NB_USER
-WORKDIR /home/$NB_USER
 
 RUN git clone https://github.com/yyuu/pyenv.git ~/.pyenv