Often due to some restrictions by the web development company, most of the web developers are forced to use free open source platforms such as Ubuntu.

Isn't the opposite the more common case, like having to work with Windows?

  How to install Gimp on Linux
  sudo apt-get install gimp

Applies to just Ubuntu. Debian doesn't even have sudo configured by default, and most other distributions don't have apt-get.

Overall a pretty biased and poorly written article.