Comment 7 for bug 41912

estagio@pc-estagio:~$ to /usr/bin/adduser nagios
bash: to /usr/bin/adduser: Filing-cabinet or in existent directory

You're running the program "to", which is part of the casu package, intended to send a short message to another user on the system. This is probably a minor typographical error.

Secondly, adduser is located at /usr/sbin/adduser rather than /usr/bin/adduser. Note the additional "s" in sbin. This another typographical error.

Thirdly, I don't think this has anything to do with the original bug.