Dockerfile updated to work on ubuntu18.04

Change-Id: I45c9e84e75afccedd16da3e6339dd00ae028288e
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/Dockerfile b/Dockerfile
index 8dd1221..43afa1c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,12 +15,11 @@
 #
 # Use Dockerfile.local for running osm/LCM in a docker container from source
 
-FROM ubuntu:16.04
+FROM ubuntu:18.04
 
-RUN apt-get update && apt-get -y install git make python python3 python-pip\
-    libcurl4-gnutls-dev libgnutls-dev tox python-dev python3-dev \
-    debhelper python-setuptools python-all python3-all apt-utils python-magic \
-    python3-pip python-pip && \
-    DEBIAN_FRONTEND=noninteractive pip3 install -U stdeb setuptools-version-command && \
-    DEBIAN_FRONTEND=noninteractive pip2 install -U stdeb
+RUN apt-get update && apt-get -y install git make python python3  \
+    libcurl4-gnutls-dev libgnutls28-dev tox python3-dev python3-pip \
+    debhelper python-setuptools python-all python3-all apt-utils \
+    python-magic && \
+    DEBIAN_FRONTEND=noninteractive pip3 install -U stdeb setuptools-version-command