After highlighting text at the command line in Gnome-Terminal with my mouse and then either (1) right-clicking to copy and paste or (2) center-clicking to paste, nothing has been copied.  I can copy fine in windows of any other Linux application and paste that material into the command line, but if I try to then copy and paste something from the command window, only the most recent non-command-window text that I copied will be pasted. 
How to copy/paste in Gnome-Terminal
gnome terminal;clipboard