Thanks for your responses!
More detail, I can’t turn on TX2 successfully. After I typed the command : sudo apt-get purge “.*:arm64”.
And the desktop get into a mess. Then, I restart the TX2.
It stuck in “login” terminal, I typed account name and press enter key. It did not show the “password:”.
tegra-ubuntu login: nvidia
So, I even can’t use ssh to connect into TX2.
Now, I am trying the following method:
Let the TX2 enter the force USB recovery mode, the host(ubuntu 16.04) connect to TX2 via USB to mirco USB.
So that, It can detect the TX2 device on host.
It shows "Bus 001 Device 006: ID 0955:7c18 NVidia Corp.".
I have no idea how to access the data in TX2's eMMC.
BTW, I am not familiar with Linux system. And thanks for solving the problem.