Update 1.
Still not working.
I did try adding the -contrib package, and that didn't make any difference. (Didn't really expect it to - but it didn't cost much to try it).
I also was able to use the cb_console_runner program (from another terminal) to run my program.
gnome-terminal -- cb_console_runner '/home/user/full-path-to-my-executable'
and that opened a terminal and ran my program fine.
I don't think CB needs to use that "helper" on linux - but if it does use it - we now know that the hang-up is NOT with cb_console_runner.
I was also able (from a terminal) to successfully run:
xterm -e cb_console_runner '/home/user/full-path-to-my-executable'
and an xterm window opened and ran my code.
So I put
xterm -e cb_console_runner
into the
Terminal to launch console programs: box, and the result is the same - nothing, just hangs CB.
So I think I am certain the issue is not in gnome-terminal, cb_console_runner, or xterm.
Still stumped -
Keep the ideas coming, please.