Byobu exits immediately after login

[yajo]

STR:

1. Use Ubuntu 24.04.
2. SSH login.
3. Run byobu-enable.
4. SSH logout.
5. SSH login again.
6. Byobu exits immediately.

Here are the contents of ~/.config/byobu/: byobu.zip

Here are the contents of ~/.profile:

_byobu_sourced=1 . /usr/bin/byobu-launch 2>/dev/null || true

Error message:

sessions should be nested with care, unset $TMUX to force

Video of the problem:

Grabacion.de.pantalla.desde.2025-07-31.08-47-02.mp4

@moduon

[niklasnatter]

Hey,
I had the same problem and found out that this happens because Byobu and fish both create a TMUX session and therefore starting Bybu inside of fish fails.

I changed my system to use bash as login shell and start fish inside of Byobu like explained here: https://unix.stackexchange.com/questions/791687/sessions-should-be-nested-with-care-unset-tmux-to-force-using-byobu-and-fis

[remixer-dec]

I faced the same issue and just changing fish to bash did not help (probably because it was in screen mode and fish was set in tmux config)
quick fix was to create ~/.byobu/no-logout-on-detach
but since this was not the root of the issue I tried to debug it and claude suggested me to do this:
sudo nano /usr/bin/byobu-launcher

*screen*)
    if [ -n "$STY" ]; then
        true
    elif  [ -n "$SSH_CONNECTION" ] # ... the rest is unchanged

it worked, but when I added fish to ~/.byobu/.screenrc it started crashing again
switching the backend from screen to tmux byobu-select-backend tmux helped