Hi @Tiger_HxH
I see a similar problem on this post:
https://forums.developer.nvidia.com/t/jetson-nano-sudo-apt-get-update-not-working-help/112980
At the end, the person with the issue reported that the problem was fixed by following the “sudo nmtui” suggestion from another person in the thread. Maybe you can take a look to the suggestions in that thread.
Enrique Ramirez
Embedded SW Engineer at RidgeRun