Comment by BV_Pradeep for Hi All,I am trying to work on Hector SLAM using rosbot simulation in gazebo. I have ROS Kinetic installed in Ubuntu 16.04 LTS.I have cloned the required repositories for hector slam. rplidar and rosbot from github into the source folder. After that I installed all the dependencies required using following command in catkin_workspace.rosdep install --from-paths src --ignore-src -r -y which results inexecuting command [sudo -H apt-get install -y gazebo7] 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: gazebo7 : Depends: libgazebo7 (= 7.15.0-1~xenial) but it is not going to be installed Depends: libsdformat4 but it is not going to be installed Depends: gazebo7-common (= 7.15.0-1~xenial) but it is not going to be installed Recommends: gazebo7-plugin-base E: Unable to correct problems, you have held broken packages. executing command [sudo -H apt-get install -y libgazebo7-dev] 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: libgazebo7-dev : Depends: libsdformat4-dev but it is not going to be installed Depends: libgazebo7 (= 7.15.0-1~xenial) but it is not going to be installed Depends: gazebo7-common (= 7.15.0-1~xenial) but it is not going to be installed Depends: gazebo7-plugin-base (= 7.15.0-1~xenial) E: Unable to correct problems, you have held broken packages. ERROR: the following rosdeps failed to install apt: command [sudo -H apt-get install -y gazebo7] failed apt: command [sudo -H apt-get install -y libgazebo7-dev] failed apt: Failed to detect successful installation of [gazebo7] apt: Failed to detect successful installation of [libgazebo7-dev] After this I invoke catkin_make which is resulting in cmake errors.catkin_make --only-pkg-with-deps rplidar_ros hector_slam This results in Base path: /home/rnd415/catkin_workspace Source space: /home/rnd415/catkin_workspace/src Build space: /home/rnd415/catkin_workspace/build Devel space: /home/rnd415/catkin_workspace/devel Install space: /home/rnd415/catkin_workspace/install Whitelisted packages: hector_compressed_map_transport, hector_geotiff, hector_geotiff_plugins, hector_imu_attitude_to_tf, hector_map_server, hector_map_tools, hector_mapping, hector_marker_drawing, hector_nav_msgs, hector_slam, hector_slam_launch, hector_trajectory_server, rplidar_ros #### #### Running command: "cmake /home/rnd415/catkin_workspace/src -DCATKIN_DEVEL_PREFIX=/home/rnd415/catkin_workspace/devel -DCMAKE_INSTALL_PREFIX=/home/rnd415/catkin_workspace/install -DCATKIN_WHITELIST_PACKAGES=hector_compressed_map_transport;hector_geotiff;hector_geotiff_plugins;hector_imu_attitude_to_tf;hector_map_server;hector_map_tools;hector_mapping;hector_marker_drawing;hector_nav_msgs;hector_slam;hector_slam_launch;hector_trajectory_server;rplidar_ros -G Unix Makefiles" in "/home/rnd415/catkin_workspace/build" #### -- Using CATKIN_DEVEL_PREFIX: /home/rnd415/catkin_workspace/devel -- Using CMAKE_PREFIX_PATH: /home/rnd415/catkin_workspace/devel;/opt/ros/kinetic -- This workspace overlays: /home/rnd415/catkin_workspace/devel;/opt/ros/kinetic -- Using PYTHON_EXECUTABLE: /usr/bin/python -- Using Debian Python package layout -- Using empy: /usr/bin/empy ...(more)