I found there are some topics on the forum about this issue.
Most of them could resolve this issue with Ubuntu 18.04 host PC.
It looks like kernel version of host PC causing this issue.
USB Timeout when flashing AGX Orin - #14 by guotl321
Could you help to provide the result of uname -r on your host PC.
and Can you run apt-get update on your host, reboot and test again?