gazebo_ros_pkgs and gazebo_ros_control, Melodic [closed]

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Hello,

Is there a recommendation as to installing the equivalent of what would be ros-melodic-gazebo-ros-pkgs and ros-melodic-gazebo-ros-control under Ubuntu 18.04? The packages don't seem to exist, running apt show gives the following output :

[~]$ apt show ros-melodic-gazebo-ros-control
N: Unable to locate package ros-melodic-gazebo-ros-control
N: Unable to locate package ros-melodic-gazebo-ros-control
E: No packages found
[~]$ apt show ros-melodic-gazebo-ros-pkgs
N: Unable to locate package ros-melodic-gazebo-ros-pkgs
N: Unable to locate package ros-melodic-gazebo-ros-pkgs
E: No packages found

Many thanks.