Taking a screenshot in Linux should be simple – and it is. Pressing the PrintScreen key is all it takes – but what if….?
There is always more than one way to do things, and taking screen shots is no exception. In fact, it may be rather surprising how many ways it can be done. It can be done from the shell, from a keypress, and from various applications.
Over at Webmaster Tips, there is an excellent article that details most of them – and a followup article that describes a few more. The articles are worth reading – even if they focus on Ubuntu. The tips transfer to other Linux variants, though.