Bionic simulation broken

[Jaeyoung-Lim]

It seems like gazebo9 on Ubuntu 18.04 is broken and therefore the bionic-simulation container cannot be built:

Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libgazebo9-dev : Depends: libignition-fuel-tools1-dev but it is not going to be installed
                  Depends: libignition-common-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
The command '/bin/sh -c wget --quiet http://packages.osrfoundation.org/gazebo.key -O - | apt-key add - 	&& sh -c 'echo "deb http://packages.osrfoundation.org/gazebo/ubuntu-stable `lsb_release -sc` main" > /etc/apt/sources.list.d/gazebo-stable.list' 	&& apt-get update 	&& DEBIAN_FRONTEND=noninteractive apt-get -y --quiet --no-install-recommends install 		ant 		bc 		gazebo9 		gstreamer1.0-plugins-bad 		gstreamer1.0-plugins-base 		gstreamer1.0-plugins-good 		gstreamer1.0-plugins-ugly 		libeigen3-dev 		libgazebo9-dev 		libgstreamer-plugins-base1.0-dev 		libimage-exiftool-perl 		libopencv-dev 		libxml2-utils 		protobuf-compiler 		ignition-edifice 	&& apt-get -y autoremove 	&& apt-get clean autoclean 	&& rm -rf /var/lib/apt/lists/{apt,dpkg,cache,log} /tmp/* /var/tmp/*' returned a non-zero code: 100