Unable to install ros-melodic on ubuntu 18.04

I am trying to create a Ros Workspace on my nvidia nano jetson. It has ubuntu version 18.04.I want to install ros-melodic but i recieve the following error message.

Error message:

The following packages have unmet dependencies: ros-melodic-desktop-full : Depends: ros-melodic-desktop but it is not going to                                                be installed                            Depends: ros-melodic-perception but it is not going                                                to be installed                            Depends: ros-melodic-simulators but it is not going                                                to be installed                            Depends: ros-melodic-urdf-sim-tutorial but it is not                                                going to be installedE: Unable to correct problems, you have held broken packages.cian@cian-desktop:~$ Unable to correct problems, you have held broken packages.

Has anybody had this problem before and do they know how to solve it?

Kind regards

I have tried to following commands without succes:List of commands:1.

sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'sudo apt install curl curl -s https://raw.githubusercontent.com/ros/rosdistro/master/ros.asc | sudo apt-key add -sudo apt update sudo apt install ros-melodic-desktop-full

sudo apt-get updatesudo apt-get upgrade

sudo apt install gazebo9-common libgazebo9-dev gazebo9 ros-melodic-gazebo-ros-pkgs ros-melodic-gazebo-dev ros-melodic-gazebo-ros-control ros-melodic-gazebo-ros ros-melodic-urdf-sim-tutorial ros-melodic-simulatorssudo apt-get install ros-melodic-desktop-full