In Windows, when I want to copy some region of text I press Alt key and then mark the region with mouse.
If I try to do this in Ubuntu, then I activate the move screen command.
How can I achieve the same effect in Ubuntu? It's funny, but I can to find this on Google, thou is seems to be very useful feature.

columns. A rectangular region, not bound to whole lines. – user unknown Jan 25 '12 at 10:22