Ubuntu 14X. “Enable Wireless” option is disabled in network settings

How to approach:

1. On laptop try to press combination FN+F1-F12 (FN+F12 on HP) and see if it enables wireless. Otherwise go to step 2.

2. Check what type of block is on wireless adapter:

 nezdolik@nezdolik-HP-Pavilion:~$ sudo rfkill list
1: hp-wifi: Wireless LAN
	Soft blocked: yes
	Hard blocked: no
2: hp-bluetooth: Bluetooth
	Soft blocked: no
	Hard blocked: no

For soft block issue:

 sudo rfkill unblock wifi

For hard block go to step 3.

3. Restart laptop, launch BIOS (F10), reset to default settings (F9), save and exit (F10).
If issue still not resolved, restart once again and before Ubuntu start up, while on black screen press combination FN+F1-F12 (FN+F12 on HP).