That irritates the heck out of me too. It is controlled by the “pam_motd” module. You can disable the motd display (and potential delay) by editing these two files: /etc/pam.d/login, /etc/pam.d/sshd, and comment out the line that has “pam_motd” in it. I only tested the secure shell change since gdm is running, but it worked. Tested on Lucid Beta.
也就是说，修改 /etc/pam.d/login 和 /etc/pam.d/sshd ，把里面的含有 pam_motd 的行都注释掉就行了。