Barry, found this on google groups http://groups.google.com/groups?hl=en&ie=utf-8&oe=utf-8&th=53656ba6fc5a8e1f&rnum=1
> When I enter su followed by my password in a terminal (Konsole & rxvt) I > now get the above error message. This occurrs immediately after > rebooting & starting kde, & with the terminal being the only app > running. > > I can su to root if kde is not running > > Any ideas how to fix the problem please? > Barry -- Nick Rout <[EMAIL PROTECTED]>