is not in the sudoers file

  • i type su to use root(if your su has no password,you should change user,type sudo passwd to give a password to su,then reture )
  • in root mode. chmod u+w /etc/sudoers
  • gedit /etc/sudoers ,type oracle ALL=(ALL) ALL (oracle is your system name) after root ALL=(ALL) ALL
  • chmod u-w /etc/sudoers

read
​​​http://www.linuxidc.com/Linux/2010-12/30386.htm​​


update 2016-8-14