I Powered the board and Ubuntu Update manager prompter to update the OS. After update the system starts in X however the USB keyboard, mouse and ethernet are not working any-more making impossible to do anything with the board.
Never update an entire distribution through that mechanism (it’s ok to do package update, just don’t change the Ubuntu version)…it doesn’t understand the hardware. You will want to flash the most recent version for your TX1, “L4T R24.2.1”, which provides Ubuntu 16.04 LTS with NVIDIA-specific hardware support (repairing the upgrade attempt is unlikely to be possible).
Assuming your host PC is Ubuntu 14.04 (or in some cases 16.04 works for the Jetson side) you can use JetPack (uses the micro-B USB cable plus wired ethernet):
[url]https://developer.nvidia.com/embedded/jetpack[/url]