#sudo #aix #linux #ubuntu #unix #chmod #sudoers #pkexec [[sudo]] su - root  chmod 777 /etc/sudoers  vi /etc/sudoers  add (on the very last line of this file!!)  <username>     ALL=(ALL) NOPASSWD:ALL  Save it (wq!)  And at last do   chmod 0440 /etc/sudoers  p.s.  ( If you have forgotten to so that, do pkexec chmod 0440 /etc/sudoers )  ( If the pkexec option doesnt work, you can try to do it with a bootable UBUNTU CD [[SUDO in debian ubuntu]] [[SUDO Bypass]]