Jetpack Ubuntu 20.04

[dusty_nv]

Hi @allan7, please see this topic regarding the switch to Ubuntu 20.04 LTS in the planned JetPack 5 release:

Jetson Software Roadmap for 2H-2021 and 2022

NVIDIA continuously invests in JetPack and regularly ships software updates to enable performance improvements, new capabilities, and support for new modules and developer kits. In this announcement, we provide details about the current software roadmap for 2H-2021 and 2022. Note that this plan is subject to change. JetPack 4.6 is our next production release, currently scheduled for July 2021. It will bring updates to the CUDA, cuDNN, and TensorRT compute stack as well as a feature-rich BSP upd…

For ROS2 Foxy container image, see here: https://github.com/dusty-nv/jetson-containers#pre-built-container-images
These have GPU support enabled and I built the ROS2 packages from source to make them work.