Function Key F3 doesnt work so WIFI cant be enabled again

[MichaelB]

Funftion + F3 in Ubuntu 16.04 doesnt work, WIFI cant be enabled Unity displays WIFI-Network as enabled

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: network-manager 1.2.0-0ubuntu0.16.04.2
ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
Uname: Linux 4.4.0-28-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Jun 28 12:29:53 2016
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2016-05-03 (55 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
IpRoute:
 default via 192.168.1.1 dev enp8s0 proto static metric 100
 169.254.0.0/16 dev enp8s0 scope link metric 1000
 192.168.1.0/24 dev enp8s0 proto kernel scope link src 192.168.1.21 metric 100
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH
 enp8s0 ethernet connected /org/freedesktop/NetworkManager/Devices/1 Kabelnetzwerkverbindung 1 94b51aed-9145-445d-ab42-7f9ea5fbd7d1 /org/freedesktop/NetworkManager/ActiveConnection/2
 wlp7s0 wifi unavailable /org/freedesktop/NetworkManager/Devices/0 -- -- --
 lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/2 -- -- --
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.