Wifi problem resolved on ubuntu
This video show you how to resolve problem wireless on Ubuntu 16.
$ sudo lshw -class network
product: product : 82540EM Gigabit Ethernet Controller so the model of my card is 82540EM
Open or create /etc/pm/config.d/config and add SUSPEND_MODULES= “82540EM”(replace 82540EM with your own model number)
$ echo “options 82540EM fwlps=N” | sudo tee /etc/modprobe.d/ 82540EM.conf and reboot.