Thank you jmlilly4
If you are upgrading from JetPack 4.4 DP, you will need to upgrade L4T as you did
sudo apt update
sudo apt upgrade
and then install nvidia-jetpack again
sudo apt install nvidia-jetpack
We will be correcting the documentation in L4T documentation to mention this extra step (install nvidia-jetpack) in case you are upgrading full JetPack.
Please refer here for instructions to upgrade JetPack:
https://docs.nvidia.com/jetson/jetpack/install-jetpack/index.html#package-management-tool