+RUN echo 'deb http://dl.bintray.com/i3/i3-autobuild-ubuntu xenial main' > /etc/apt/sources.list.d/i3-autobuild.list && \
+ apt-get update && \
+ apt-get --allow-unauthenticated install i3-autobuild-keyring && \
+ rm -f /var/lib/apt/lists/dl.bintray.com_i3_i3-autobuild-ubuntu_* && \
+ apt-get update && \