Using Python3 and cv_bridge with ROS Melodic

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I have to use the melodic and Ubuntu 18.04 because I am using a NVIDIA plateform which oblige the using of this distribution, and does not support yet the Ubuntu 20.04.

That's not necessarily true.

Docker is a very viable way of running code with requirements which cannot be satisfied by the host system.

Another option could be singularity.

If you have libraries or binaries which must interact with the host FS or are integrated in some other way with it, using Docker becomes a bit more difficult, but it may still be worth it.

I would perhaps recommend to see how other people are using Docker with Jetsons/Xaviers/etc.

I tried the Docker, but I found that it is not suitable for my application. In fact, I am using a different sensors LIdar, CameraI, IMU...

It's perfectly possible to use devices on the host inside a container.

But if you're not comfortable with Docker yet, then you might want to try other approaches.

I just wanted to mention it (for future readers).