You are right, I used Jetson as a host to test if USB is connected. Then I installed Windows and Ubuntu16.04 double system, used Ubuntu to flash, and OS flashed correctly. When the OS flashed completely, TX2 rebooted as a host, and I did nothing. Then it showed an error on CUDA, Here is the information:
Error: CUDA cannot be installed on device. This may be caused by other apt-get command running on device when installing CUDA. Please use apt-get command in a terminal to make sure following packages are installed correctly on device before continuing:
cuda-toolkit-9-0 libgompl libfreeimage-dev libopenmpi-dev openmpi-bin
After these package are installed on device, please Enter key to continue.
So what’s problem of this?