WiFi not available - SOLVED

To resolve the WiFi not available message in Linux:

1. Find out which network interface is having the problem using

   # iwlist scan.

   In my case, it was wlp86s0

2. See the status of the adapter with nmcli device status
3. Use rfkill list to see if the adapter is hard or soft blocked
4. Unblock the wifi with rfkill unblock wifi
5. Bring that network interface down. Eg, by typing
   

   # sudo ip link set wlp86s0 down

6. Then bring it back up. Eg, by typing

   # sudo ip link set wlp86s0 up