Why does tmux/byobu fill my screen with garbage characters when I copy a selection?

There is an option set-clipboard that will try to copy your selection to the x-clipboard with an escape sequence.

:set-option -s set-clipboard off

gnome-terminal does not support this method of using the clipboard, which is the default terminal in Ubuntu.

Edit ~/.tmux.conf or with Byobu $HOME/.byobu/.tmux.conf:

set -g set-clipboard off

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