Mahmoud Kassem

There may only be a few hundred thousand users running desktop Linux worldwide, compared with tens of millions of Mac users and hundreds of millions of Windows users, but almost all of us are using Linux on a daily basis.

In addition to the article examples (see the source), most ADSL Home routers and Home WiFi Access points uses linux. You are using Linux.

source: DesktopLinux.com Article

Taking a screen shot in Ubuntu (and probably most GNU/Linux distributions) is basically by pressing your keyboard print screen button and then choosing where you want to save a PNG image of your screen without any additional applications required.

Steps:
1. Press Print Screen
2. Click on the Save button (or Choose a folder other than the default then Save)