I installed xterm, and now it works! Thanks both of you! But is there any way to use c::b without xterm, only using the standard Linux terminal. I'm not that familiar with xterm, but from what I understand it's just a terminal isn't it?
Yes, but, you have to change the setting in CB to use that terminal.
Note: That means you need to know what parameters to use in the CB Settings.
NOTE: I am not sure there really is a standard Linux terminal; each Linux distro seems to have a different terminal as default.
I tend to change mine to
mate-terminal -t $TITLE -x
But, I use a Debian [distro] with the Mate Desktop
Tim S.