I want to use ros-hydro-gscam for opening video file. But it is not getting installed and giving error as,

Sep '17

I’m using rosbag info from the command line but after running sudo apt-get install python-rosinstall it has broken python-rosbag and now I can’t get it to reinstall.

sudo apt-get install python-rosbag The following packages have unmet dependencies: python-rosbag : Depends: python-roslib but it is not going to be installed E: Unable to correct problems, you have held broken packages.

sudo apt-get install python-roslib The following packages have unmet dependencies: python-roslib : Depends: catkin but it is not going to be installed E: Unable to correct problems, you have held broken packages.

sudo apt-get install catkin The following packages have unmet dependencies: catkin : Depends: python-catkin-pkg but it is not going to be installed E: Unable to correct problems, you have held broken packages.

sudo apt-get install python-catkin-pkg python-catkin-pkg is already the newest version (0.3.6-1). 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

I’ve tried everything from cleaning, update, removing all ROS packages but it’s stuck in circular dependency with catkin.