/etc/byobu/backend is in byobu 5.16-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # BYOBU_BACKEND can currently be "screen" or "tmux"
# Override this on a per-user basis by editing "$BYOBU_CONFIG_DIR/backend"
# or by launching either "byobu-screen" or "byobu-tmux" instead of "byobu".
#BYOBU_BACKEND="tmux"
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