[Quick-Fix] Kali 2.0 wireless bug

So even after a fresh install of Kali Linux 2.0, few of the applications still seem buggy. One of them would be the wireless hacking module airmon-ng.
Ok! So while I was trying to sniff the networks around my hotel, I faced this bug with airmon-ng and I spent a good half an hour trying to understand what was going wrong as the tool based world gets you addicted to the tools so much that you sometimes are mislead by the errors.

This bug occurs while trying to sniff wireless traffic after attempting to set the wireless network card into Monitoring Mode.

~# airmon-ng start wlan0
...
~# airodump-ng wlan0mon
ioctl(SIOCSIWMODE) failed: Device or resource busy

This error basically occurs because airmon-ng fails in setting the wireless network card in monitoring mode. Hence the quick resolution to this would be setting the network card into monitoring mode.

~# ifconfig wlan0mon down
~# iwconfig wlan0mon mode monitor
~# ifconfig wlan0mon up
~# airodump-ng wlan0mon

And, tadaaaaaaaaaaaaaaaaaaaaaa......!!!!!!!
This should get your wireless cards into sniffing mode and then happy hacking to you folks.

Update:
Another way to get this running (I guess this is the official solution that I saw in kali forums) -

~# airmon-ng check kill

Have Fun with the WiFu.

[Quick-Fix] Kali 1.1 to Kali 2.0 update bug

A few hours ago I just tried to do a upgrade of my Kali 1.1.0 to the new and beautiful looking Kali 2.0 with the apt-get update && apt-get dist-upgrade way. The result was as terrible as I had expected. A complete crash with only message.

Oh no! Something has gone wrong.
A problem has occurred and the system can't recover.
Please log out and try again.

A terrible feeling when the grey page looks at your face and your head says to you,

"hah you should have rather done a fresh install and wasted 10 hours from your life taking a backup and reformatting your LVM encrypted system."

Here is a small bypass for all the folks who are just going to wait for the guys behind Kali to fix this issue, just like me.

Ok firstly open the below file in an editor

root@kali:~# nano /etc/gdm3/daemon.conf

Now add the following two lines. These enable the system to auto log into the non-root user after booting up. I still haven't completed the debugging process and hence am not able to give the exact reason for this error.

AutomaticLoginEnable = true
AutomaticLogin = <Non-root Username>

Enabling automatic login into root user is not recommended, also it will not work for root user.