Connecting to multiple wifi network using two wifi card simultaneously
 

I want to connect to two different wifi networks using two wifi cards (one is internal wifi card of the laptop and the other is the external usb wifi card). One wifi network is the one created by the AR Drone 2.0 which is used to control the drone and the other wifi network will be used to connect to the internet. Can anyone suggest me how to achieve this?

I suppose you might be able to do that. Normally it has no useful place if all you wish to do is connect to two wan connections. Other uses may have value. We'd need to know maybe your distro/version to start and how you normally connect to wifi. Part of the problem here is that the tools linux and other OS's have for connecting makes this more difficult by design.

https://askubuntu.com/questions/9032...esinternal-and is an example I think of what you may wish to do.

yes, i think it would be best to uninstall network-manager straight away and accomplish this with systemd(-networkd).
some reading is required before asking further questions; this is the sort of project where you have to do a lot of work on your own.

otoh, if the askubuntu answer works for you, all the better.