Protecting against bad USB in ubuntu

I am referring to this thread: How to prevent BadUSB attacks on linux desktop

Since i want to install ubunto onto a possible infected usbDrive using a live DVD and the installation manager i was wondering if the answer of user10008 in the above named thread would be enough protection for me.

Furthermore want to ask: is it really enough to block HID devices? user10008 states in his reply that network devices are no real danger but i am wondering if given the fact that there is an already activated internet connecion on the victim PC the addition of a new network adapter by bad USB could be an attack vector that a possibly nearby living attacker could use to get total controll of the system.