I have a problem with a fresh install of Kubuntu 8.10. kdm says 'login failed' when I set a password (with passwd on the command line) that contains special characters.
The initial password that was set during the installation was ok, though, but after a change I can only login on the console.

I just know that it has not to do with keyboard encoding because all special characters appear correctly in the user name field.

Any hint is appreciated.