I had a problem with power button on my Dell Optiplex GX270 in lucid (Server 
Edit.).
I just copied a old script:
# /etc/acpi/powerbtn.sh

from another machine (server too) and now it works perfect :)

$ cat /etc/acpi/powerbtn.sh
#!/bin/sh
# /etc/acpi/powerbtn.sh
# Initiates a shutdown when the power putton has been
# pressed.

# Skip if we just in the middle of resuming.
test -f /var/lock/acpisleep && exit 0

# If gnome-power-manager or kded4 are running, let
# them handle policy This is effectively the same as 'acpi-support's
# '/usr/share/acpi-support/policy-funcs' file.

if pidof gnome-power-manager kded4 > /dev/null; then
    exit
fi

# If all else failed, just initiate a plain shutdown.
/sbin/shutdown -h now "Power button pressed"

-- 
Depressing power button does not shutdown computer
https://bugs.launchpad.net/bugs/529686
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