El ordenador no se apaga

Edita el fichero modules

sudo gedit /etc/modules

y añade lo siguiente, poniéndolo al principio:

apm power_off=1

________________

# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.

apm power_off=1
lp