This is the solution
dsin@dsin-laptop:~$ sudo ifconfig wlan0 upThanks to winunixmax's webmaster for a very useful solution. I think the original post is for Fidora. It works with ubuntu as well :)
[sudo] password for dsin:
SIOCSIFFLAGS: Operation not possible due to RF-kill
dsin@dsin-laptop:~$ rfkill list
0: phy0: Wireless LAN
Soft blocked: yes
Hard blocked: yes
1: hp-wifi: Wireless LAN
Soft blocked: yes
Hard blocked: no
2: hp-bluetooth: Bluetooth
Soft blocked: yes
Hard blocked: no
dsin@dsin-laptop:~$ rfkill unblock all
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