How do I get Ctrl+Left / Ctrl+Right to jump a word again in byobu?

One solution was to switch the backend to screen. However, I had recurring issues with ctrl-right when I did that. To do that change ~/.byobu/backend to BYOBU_BACKEND=screen.

I subsequently found a much better solution using tmux from this bug. Create ~/.byobu/.tmux.conf with this value:

set-window-option -g xterm-keys on

Then ~/.byobu/keybindings.tmux with:

unbind-key -n C-Left
unbind-key -n C-Right

Now ctrl-left and ctrl-right jump one word at a time in tmux.