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. Bring that network interface down. Eg, by typing
   

   # sudo ip link set wlp86s0 down

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

   # sudo ip link set wlp86s0 up