i had similar issues in my current system with the hanging on reboot and the methods described here fixed it Ubuntu 16.04 Hanging on reboot
note that it took a couple full reboot cycles to get it to take effect
i had similar issues in my current system with the hanging on reboot and the methods described here fixed it Ubuntu 16.04 Hanging on reboot
note that it took a couple full reboot cycles to get it to take effect