Ubuntu 16.04 wifi wireless disappear fix

https://it.toolbox.com/blogs/jeffhoogland/restarting-networkmanager-after-suspend-in-ubuntu-1604-091816

To do this we create the file /etc/systemd/system/wifi-resume.service using our text editor of choice with the contents:


[Unit]

Description=Restart networkmanager at resume

After=suspend.target

After=hibernate.target

After=hybrid-sleep.target


[Service]

Type=oneshot

ExecStart=/bin/systemctl restart network-manager.service


[Install]

WantedBy=suspend.target

WantedBy=hibernate.target

WantedBy=hybrid-sleep.target