Buenos dias maregeo,
estaria bien que pusieras el codigo para ver donde podria estar el problema y tampoco
mencionas que distro utilizas, quizas existan diferencias entre ellas .................
te pongo el /etc/sudoers de debian-wheezy y ojala te sirva.
Código:
# This file MUST be edited with the 'visudo' command as root.
#
# Please consider adding local content in /etc/sudoers.d/ instead of
# directly modifying this file.
#
# See the man page for details on how to write a sudoers file.
#
Defaults env_reset
Defaults mail_badpass
Defaults secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
# Host alias specification
# User alias specification
# Cmnd alias specification
# User privilege specification
root ALL=(ALL:ALL) ALL
# Allow members of group sudo to execute any command
%sudo ALL=(ALL:ALL) ALL
# See sudoers(5) for more information on "#include" directives:
#includedir /etc/sudoers.d
y recuerda.................
This file MUST be edited with the 'visudo' command as root.