How do i copy text from a text editor, let's say gedit into a terminal session on ubuntu/gnome? I am on ubuntu 12.0.4 using gnome classic.
Just select the text you want to copy, and then middle click on the terminal. On most *nix systems, selecting copies and middle click pastes.
Alternatively, you can select => right click=>copy => terminal => right click=> paste
Or, simply Ctrl+C,Ctrl+V
Have a look here for a short explanation of the Linux/Unix clipboard and the X buffer.