Xenial environment variables have been added.

docker/xenial/Dockerfile

@@ -8,6 +8,8 @@ RUN apt-get -y update && apt-get install -y \
   sudo \
   vim
 
+ADD etc/environment /etc/environment
+
 RUN useradd -m -s /bin/bash vagrant
 ADD home/vagrant/.ssh/authorized_keys /home/vagrant/.ssh/authorized_keys
 RUN chmod 0700 /home/vagrant/.ssh/

docker/xenial/etc/environment

+LC_ALL="C"
+LC_CTYPE="C"
+LC_MESSAGES="C"
+PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
+