RFkill is a subsystem of the linux kernel that can enable and disable wireless devices. RFkill can also list if a device is soft-blocked or hard-blocked.
Enabling Wireless Devices
First, see if devices are soft-blocked or hard-blocked
If your devices say they are soft-blocked, type
rfkill unblock wifi
If you devices say they are hard-blocked, you will need to enable your wireless card usually by a button or switch on your computer.
Disabling Wireless Devices
To disable wireless devices, type
rfkill block wifi
To enable Bluetooth, type
rfkill unblock bluetooth