Ubuntu gdm theme looks odd when asking for krb password

Try adding the following to /etc/pam.d/common-auth:

auth optional pam_krb5.so try_first_pass missing_keytab_ok

and set the unix password different from the user's kerberos password. GDM will
correctly ask for the user's kerberos password, however, the prompt will come on
two lines:

Please enter the password for:
<email address hidden>

and the second line will be clipped by the input box. It should work so that the
text moves up as needed.