How to enable the VDPAU Hardware Acceleration in Flash player on Ubuntu

In this guide we will see how to enable the VDPAU hardware acceleration in flash player on Ubuntu and derivatives for any Nvidia, Intel and AMD GPU.
VDPAU (Video Decode and Presentation API for Unix) is the name of a library that allows to assign a part of the workload of decoding and post-processing a video to the GPU; this features can be used even for Flash playback.
In Ubuntu the native support for the VDPAU hardware acceleration is not active by default, but it can ben enabled with the following procedure:

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