Install and configure a firewall on Ubuntu

Laptops, smartphones, tablets, smart TVs, etc. … in the current era we hardly find an electronic device that isn’t connected to the Internet. It is very practical to have the full power of the Net at our fingertips, but unfortunately it is not without risks as the threat of being hacked is a real threat.
One of the best ways to mitigate this risk is to install and configure a firewall. Let see how to do it on Ubuntu.
Install and configure a firewall on Ubuntu

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Setup a network proxy on Ubuntu

With this guide we will see how to set a network proxy on Ubuntu. We have already seen how to setup Mozilla Firefox to use a proxy, how to setup Google Chrome to use a proxy, and how to setup any browser to use a SSH proxy, but by setting a network proxy on Ubuntu, all network applications will automatically use it.

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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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