Bump Python to 3.7 for xenial
diff --git a/bin/apt-dependencies.sh b/bin/apt-dependencies.sh
index 8e66f74..aef984f 100755
--- a/bin/apt-dependencies.sh
+++ b/bin/apt-dependencies.sh
@@ -78,6 +78,16 @@
     reprepro createrepo rsync \
     vim-tiny screen \
 
+if [[ ${VERSION_CODENAME} == "xenial" ]]; then
+  apt install -y software-properties-common
+  add-apt-repository ppa:deadsnakes/ppa
+  apt-get update
+  apt install -y python3.7 python3.7-dev
+  rm /usr/bin/python3
+  ln -s /usr/bin/python3.7 /usr/bin/python3
+  pip3 install setuptools
+fi
+
 # Node.js
 if [ "${ARCH}" == "ppc64le" ]; then
   apt-get install -y nodejs npm