I've written a tutorial explaining how to fix several problems with Realtek Wireless drivers and network connectivity freezes and drops on Ubuntu 16.04 Xenial Xerus, including modprobe configuration changes and kernel module re-insertion workaround after waking from suspend, other tips and tricks, and more. Have fun. http://www.dedoimedo.com/computers/ubuntu-xerus-realtek-bug.html Cheers, Mrk