Hello can I install Ubuntu 20.04 in Jetson Xavier NX?

Hello can I install Ubuntu 20.04 in Jetson Xavier NX?

L4T (Linux for Tegra) is just Ubuntu plus NVIDIA drivers. L4T R35.x uses Ubuntu 20.04. You would want to flash the most recent R35.x. To find this, go here:
https://developer.nvidia.com/linux-tegra

Note that JetPack is just a GUI front end to the flash software, and this runs on an Ubuntu host PC (for L4T R35.x you’d want either an Ubuntu 20.04 host PC, or Ubuntu 18.04). You’ll find that JetPack and SDK Manager (which is the smart network layer on top of JetPack) have releases tied to the L4T release (if you pick one release, then you’ve picked the other). Most people use JetPack/SDKM to run the flash.

If you have need to pick alternate versions and have a newer JetPack, then you can start it (on the host PC) like this:
sdkmanager --archived-versions
(older sdkmanager --archivedversions)

Please note that there are different Jetson models. If you have a third party carrier board, then you will need that manufacturer’s flash software.

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