a new user named by 'nvidia' is found after upgrading to l4t 24.2 using Jetpack2.3

why does l4t add the new user?

$ users
nvidia ubuntu ubuntu ubuntu

If you read the release notes for this L4T_R24.2 release, you will see that the user account “nvidia” is going to be the default for future L4T releases. The username ubuntu is also retained in this version for compatibility reasons.

Don’t expect to see ubuntu in the future L4T releases.

Okay, thank you very much.