Installing PyTorch 2.x on Python 3.9 in Xavier

Hi,

Currently, we only have prebuilt for the default Python version.
For JetPack 5 which is Ubuntu20.04, it is Python 3.8.

Please build PyTorch from the source if other Python versions are required.
Below are the building instructions for your reference:

https://forums.developer.nvidia.com/t/pytorch-for-jetson/72048

Instructions
Build from Source

Thanks.

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