4 steps. Install Ubuntu. Make space for Windows. Install Windows. boot-repair. Easy, right? WRONG! The task of installing Windows next to a pre-existing Ubuntu installation on an old Mac Mini could be painfully long. 
Attaching a VDI file to your system as a block device and mounting its partitions (if any). 
In this article, we extract audio from a video, transcode it and add it to another video. A series of articles in which we perform many video manipulation tasks using the awesome FFmpeg tool. How to convert a video to make it work on your old DivX device using the excellent cross-platform tool ffmpeg. 
How to make and download a raw Linux HDD image remotely using ssh and dd in Linux. This is about granting WRITE_SECURE_SETTINGS to your application or writing directly to system settings. 
This is a series about painting with mathematics in shaders. 
A brief introduction to GLSL that should prepare you to start writing shaders.