Configure Byobu Safely with Its Terminal Menu

You will use byobu-config to change Byobu's status notifications, escape key and automatic login launch setting, then verify the files it changed. The installed package here is Byobu 6.11-0ubuntu1.1. Allow about ten minutes, including a short check before and after each change.

This is a terminal user-interface program, not a command with a collection of documented flags. It needs a real terminal and the Python Newt module. It normally changes only your user configuration under $HOME/.byobu, but the login-launch choice can affect future shells, so read each menu label before applying it.

1. Check the prerequisites

Run these commands as your ordinary user:

$ command -v byobu-config
/usr/bin/byobu-config
$ printf 'HOME=%s\n' "$HOME"
HOME=/home/your-user
$ python3 -c 'import snack; print("python3-newt is available")'
python3-newt is available

The final command must be run in the same Python environment that Byobu uses. If it reports ModuleNotFoundError, install the distribution package through your normal package-management process:

$ sudo apt install python3-newt

This is the only elevated command in the basic setup. Do not run the configuration utility with sudo: root would create or alter root's Byobu configuration instead of yours.

2. Open the menu in a terminal

Start it from an interactive terminal:

$ byobu-config

The screen shows Byobu Configuration Menu. Use the arrow keys to select an item, press Enter to open it, use Tab to move between controls, and press Escape to leave a screen. The main menu has four actions:

• Help -- Quick Start Guide opens the help for the selected backend.
• Toggle status notifications controls items displayed in the status line.
• Change escape sequence changes the control key used with Byobu.
• A login-launch toggle enables or disables Byobu's automatic launch at login.

The menu's login item is worded according to the current state. If it says Byobu currently launches at login, selecting it offers to turn that off. If it says Byobu currently does not launch at login, selecting it offers to turn it on.

3. Change status notifications

Select Toggle status notifications. The checklist is built from the installed status definitions, so the names can differ between releases. Select or clear only the items you need, then choose Apply. Choose Cancel if you opened the screen to inspect it.

For the default tmux backend, the utility writes the enabled and disabled items to $HOME/.byobu/status. If that file did not exist, it creates a user copy based on the package default. Check the result without changing it:

$ test -f "$HOME/.byobu/status" && sed -n '1,120p' "$HOME/.byobu/status"

Lines such as tmux_right="... #memory ..." use a leading hash to disable an item. The exact line layout belongs to the installed status file, so preserve unrelated entries when reviewing it. Byobu marks the configuration as needing a reload. In an existing session, press F5 to reload the profile and refresh the status line.

4. Change the escape key carefully

Choose Change escape sequence and enter one letter. The menu displays the setting as ctrl- followed by that letter, so a value of A means the familiar Ctrl-A prefix. The utility rejects digits, slash and backslash and limits the entry to one character.

Do not choose a key combination your shell or terminal workflow already relies on. If you apply the change, use the reload instruction shown by the menu. For the tmux backend, the setting is recorded in $HOME/.byobu/keybindings.tmux; for GNU Screen it is stored in $HOME/.byobu/keybindings.

If the new prefix is awkward, reopen the utility, choose the same item and restore A. That is the normal undo operation. Existing sessions may need F5, or a detach and reattach, before the new prefix is active everywhere.

5. Decide whether to launch Byobu at login

This menu item runs Byobu's login-launch helper. Enabling it can add or use login-shell configuration, and disabling it removes Byobu's automatic launch path. This changes future logins, not the current terminal, so do not use it on a shared account without checking the account's startup policy.

Before changing it, inspect the current state:

$ grep -n 'byobu-launch' "$HOME/.profile" 2>/dev/null || true
$ test -e /etc/profile.d/Z97-byobu.sh && echo 'system profile hook present' || true
$ test -e "$HOME/.byobu/disable-autolaunch" && echo 'user disable marker present' || true

After applying the choice, exit the menu and inspect the same paths again. If the result is not wanted, select the opposite menu state rather than manually deleting lines from a login file. Keep a backup before hand-editing any startup file:

$ cp --preserve=all "$HOME/.profile" "$HOME/.profile.byobu-backup"

6. Recover from the usual failures

If you see ERROR: Could not import the python snack module, install python3-newt and retry. If the menu opens but help fails, the selected backend's help file may be missing; leave the menu with Escape and use the relevant Byobu manual pages instead. If a remote terminal shows broken function keys, the menu itself can still be used with arrow keys, Enter, Tab and Escape, while the session's terminal type may need separate investigation.

To abandon an uncommitted screen, choose Cancel wherever it is offered, then press Escape until the main menu closes. Status and escape-key changes are user-level configuration, not system-wide changes. The login-launch action is the one that deserves a second look because it changes how later login shells start.