command man some option not work

hi,
what these command not work in calculate-linux but work other distribution (ex:aptosid)?
1-man -f echo
2-man -k ls
3-whatis echo
stdout: nothing appropriate.
thanks.

Create /var/cache/man directory, and change owner to man:man, after this perform

mandb

We will fix this bug in the next stage.

thanks for answer.
your idea for change owenr to man:man this mean:
chown man:man /var/cache/man