When I try to install map_server on ROS, it occurred errors like the following:
Reading package lists... DoneBuilding dependency tree Reading state information... DoneSome packages could not be installed. This may mean that you haverequested an impossible situation or if you are using the unstabledistribution that some required packages have not yet been createdor been moved out of Incoming.The following information may help to resolve the situation:The following packages have unmet dependencies: ros-hydro-map-server : Depends: ros-hydro-roscpp but it is not going to be installed Depends: ros-hydro-rostest but it is not going to be installed Depends: ros-hydro-tf but it is not going to be installedE: Unable to correct problems, you have held broken packages.How am I supposed to solve it?