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I can get the Shift-F1 to show the help for a user that has fish as login shell.

I get a glimpse of an error message that gets quickly overwritten.

It says

fish: Variables may not be used as commands. Instead, define a function like 'function BYOBU_PAGER; sensible-pager $argv; end' or use the eval builtin instead, like 'eval $BYOBU_PAGER'. See the help section for the function command by typing 'help function'.

If I change the login shell back to /bin/bash with chsh then Shift-F1 will show the help page as expected.

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After investigating a bit it seems that Shift-F1 is keybinding is defined in /usr/share/byobu/keybindings/f-keys.tmux

bind-key -n S-F1 new-window -k -n help '$BYOBU_PAGER $BYOBU_PREFIX/share/doc/byobu/help.tmux.txt'

And that command fails because it's executed in the fish shell and fish shell doesn't allow a variable to be used as a command.

Changing the binding to

bind-key -n S-F1 new-window -k -n help 'sh -c "$BYOBU_PAGER $BYOBU_PREFIX/share/doc/byobu/help.tmux.txt"'

will work since it will use sh to run the command.

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