remove wget and gdebi for xvfb and add to apt-get (#4791) (#4796)

Co-authored-by: andrewcoh <54679309+andrewcoh@users.noreply.github.com>

Dockerfile

-FROM nvidia/cuda:10.0-cudnn7-devel-ubuntu18.04
+# From https://gitlab.com/nvidia/container-images/cuda/blob/master/doc/supported-tags.md
+FROM nvidia/cuda:10.2-cudnn7-devel-ubuntu18.04
 
 RUN yes | unminimize
 
   apt-get install -y --no-install-recommends wget curl tmux vim git gdebi-core \
   build-essential python3-pip unzip google-cloud-sdk htop mesa-utils xorg-dev xorg \
-  libglvnd-dev libgl1-mesa-dev libegl1-mesa-dev libgles2-mesa-dev && \
+  libglvnd-dev libgl1-mesa-dev libegl1-mesa-dev libgles2-mesa-dev xvfb && \
-  wget http://security.ubuntu.com/ubuntu/pool/universe/x/xorg-server/xvfb_1.18.4-0ubuntu0.10_amd64.deb && \
-  yes | gdebi libxfont1_1.5.1-1ubuntu0.16.04.4_amd64.deb && \
-  yes | gdebi xvfb_1.18.4-0ubuntu0.10_amd64.deb
+  yes | gdebi libxfont1_1.5.1-1ubuntu0.16.04.4_amd64.deb
 RUN python3 -m pip install --upgrade pip
 RUN pip install setuptools==41.0.0