Ubuntu – Why is sudoers NOPASSWD option not working

sudo

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

Best Answer

You should put that line after the line with the rule for the sudo group, because, as the sudoers man page states:

   When multiple entries match for a user, they are applied in order.
   Where there are multiple matches, the last match is used (which is not
   necessarily the most specific match).
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