I am new to this field.
I downloaded Ubuntu from [here](https://www.ubuntu.com/download/desktop). Then I went to [here](http://gazebosim.org/tutorials?tut=ros_installing) and opened ROS installation page. Finall I went to [here](http://wiki.ros.org/melodic/Installation/Ubuntu) and on 1.4 installation when I typed "sudo apt install ros-melodic-desktop-full" and got error "E:Unable to locate package ros-melodic-desktop-full".
Yes I know it is answered [here!](https://answers.ros.org/question/300054/when-installing-ros-melodic-i-keep-getting-this-error-e-unable-to-locate-package-ros-melodic-desktop-full/).
Yes this question isn't directly relevant to gazebo forum but I am asking it here because I am a beginner and I am expecting some seniors help of step by step instructions in installing gazebo with ROS (as they already know what to do/select in each turn)! My laptop is EliteBook 8470p and CPU information from CPU-Z is provided.
My work is on UAV swarm simulation, what I want to know:
1. What Ubuntu should I install (of course Ubuntu from above downloaded link didn't work).
2. In ROS installation which will be better for me?
3. In gazebo installations, which will work for me?
Instructions with links are appreciated, thanks in advance!
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