Сломанные пакеты при установке Gazebo 8.0 в Ubuntu

Я пытаюсь установить симулятор Gazebo 8.0 для Ubuntu 16.04. Я попробовал пакет.deb, который дал мне этот скрипт bash:

gazebo8_install.sh:

# Description:
# This script installs gazebo onto an Ubuntu system.

codename=`lsb_release -sc`

# Make sure we are running a valid Ubuntu distribution
case $codename in
  "xenial" | "yakkety" )
  ;;
  *)
    echo "This script will only work on Ubuntu xenial, and yakkety"
    exit 0
esac

# Add the OSRF repository
if [ ! -e /etc/apt/sources.list.d/gazebo-latest.list ]; then
  sudo sh -c "echo \"deb http://packages.osrfoundation.org/gazebo/ubuntu ${codename} main\" > /etc/apt/sources.list.d/gazebo-latest.list"
fi

# Download the OSRF keys
has_key=`apt-key list | grep "OSRF deb-builder"`

echo "Downloading keys"
if [ -z "$has_key" ]; then
  wget --quiet http://packages.osrfoundation.org/gazebo.key -O - | sudo apt-key add -
fi


# Update apt
echo "Retrieving packages"
sudo apt-get update -qq
echo "OK"

# Install gazebo
echo "Installing Gazebo"
sudo apt-get install gazebo8 libgazebo8-dev

echo "Complete."
echo "Type gazebo to start the simulator."

Я запустил его на терминале с таким выводом:

Downloading keys
OK
Retrieving packages
OK
Installing Gazebo
Reading package lists... Done
Building dependency tree       
Reading state information... Done
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:
 gazebo8 : Depends: libgazebo8 (= 8.0.0-1~xenial) but it is not going to be installed
           Depends: libsdformat5 but it is not going to be installed
           Recommends: gazebo8-plugin-base
 libgazebo8-dev : Depends: libsdformat5-dev but it is not going to be installed
                  Depends: libignition-math3-dev (> 3.0.0-1) but it is not going to be installed
                  Depends: libignition-transport3-dev (> 3.0.1-1) but it is not going to be installed
                  Depends: libignition-msgs-dev (>= 0.6.999) but it is not going to be installed
                  Depends: libgazebo8 (= 8.0.0-1~xenial) but it is not going to be installed
                  Depends: gazebo8-plugin-base (= 8.0.0-1~xenial)
E: Unable to correct problems, you have held broken packages.
Complete.
Type gazebo to start the simulator.

Это говорит, что я держал сломанные пакеты. Но команда apt-mark showhold возвращается пустым. Я пытался запустить беседку, но она начинается gazebo7.0 не 8.0, В чем здесь проблема и как мне ее решить?