I have a NOPASSWD line in /etc/sudoers (edited with visudo)

gatoatigrado    ALL=(ALL) NOPASSWD: /bin/set-slow-cpufreq

However, the output is,

gatoatigrado@coral:~> sudo -n /bin/set-slow-cpufreq

sudo: sorry, a password is required to run sudo

This kind of command works on an OpenSuSE machine, but not on Ubuntu 11.10. What am I doing wrong?

Note: I cannot find any relevant system log messages, e.g. via tail -f /var/log/syslog.

edit

Here is /etc/sudoers.

Defaults    env_reset



# things I've tried copying from an opensuse machine

Defaults always_set_home

Defaults env_keep = "LANG LC_ADDRESS LC_CTYPE LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE LC_TIME LC_ALL LANGUAGE LINGUAS XDG_SESSION_COOKIE"



root    ALL=(ALL:ALL) ALL

gatoatigrado ALL=NOPASSWD: /bin/set-slow-cpufreq

%admin ALL=(ALL) ALL

%sudo   ALL=(ALL:ALL) ALL