What if instead of launching applications using gestures, you’d like to use gestures to secure your device? LG offers such functionality through the Knock Code security system found on their newer handsets. But thanks to XDA Recognized Developer MohammadAG and the magic of Xposed Framework, you can use it on your device as well.

There are a few caveats with this implementation. For starters, rather than being able to enter your knock code while the device is off, you first have to power on your screen, after which you can input the code. In addition, the module is currently only compatible with Android 4.4, but compatibility will be added for 4.2 and 4.3 very soon. Finally, while using a knock code is fairly convenient, this is not a very secure method of locking your device. This is because due to a limitation in Xposed, the file where the code is stored is world-readable. Furthermore, this essentially functions as a 2×2 PIN password, which itself isn’t very difficult to break. If you wish to get Knock On-style functionality on your own device, head over to the module thread and give this a shot.

Ubuntu is pretty neat ,but with windows software its even better!
Almost any windows software can be run on ubuntu using a software WINE.

Official website-http://www.winehq.org/
A nice set of instructions is already present on the web, here are some useful links-
http://www.wikihow.com/Install-Wine-on-Ubuntu
http://www.winehq.org/download/ubuntu 

Most of the softwares work fine but there is a problem with .NET Framework.
I will post a solution soon.If u have any query related to it or anything else, Please do comment.

I once heard an author say that when you are a child you use a computer by looking at the pictures. When you grow up, you learn to read and write.

Linux is a very powerful os but to unleash its full power , terminal use is a must.
I was just googling around and found a cool website t0 learn Linux terminal.
Here's the link - http://linuxcommand.org/lc3_learning_the_shell.php .Enjoy