i got the same thing basically
in fact my whole install seems to be plagued with various error messages. Including:
chown: invalid user: 'root.__USERS.__'
which sounds kinda worrying....
On my dell server i have to install from netinstall version of ubuntu 8.04 since the current CD version, of both Ebox and Ubuntu hit a (well documented) install error in that they cannot read from the CD once install begins. This error seems specific to my Dell poweredge 2400 series. I have 3 servers and they all behave the same.
So.. net install it is.
I selected printer and openssh servers from Ubuntu
then i installed ebox 1.4 usersandgroups from CLI
followed by samba after which i started to see those type of errors mentioned.
so i figured i'd flush ebox and try again. Interestingly, apt-get remove --purge libebox
doesn't fully flush ebox like it should - some folders seem to get left behind as they still contain items. This leaves me with a very messed system. Glad its a test server.