I've found a workaround to copy text from gnome-terminal. It is via screen. ^{Credit goes to this answer}

1. Type screen in the terminal




2. Press Ctrl-A-[ to Enter the copy mode




3. Move your cursor to the desired start location.




4. Hit Enter to start copying.




5. Press and hold → or ← key to select text




6. Hit Enter again to stop copying.




7. Then move your cursor the the location you want to paste.




8. Press Ctrl-A-] to paste the text.

For a more complete screen tutorial, see this page.