Apt-upgrade on fresh JetsonNano install fails

You may refer to the following thread to check if it could help.
Errors on nvidia-l4t-xusb-firmware and nvidia-l4t-initrd

  1. modify your python version in /usr/sbin/l4t_payload_updater_t210
  2. direct re-flash Jetpack4.6.3 to your board through SDK Manager or flash script