Can't use sudo without password on Ubuntu 12

Question

Maybe my question is stupid but I'm really stuck...

My OS is Ubuntu 12.04
My sudoers:

 # # 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 dart ALL=(ALL) NOPASSWD: ALL # Members of the admin group may gain root privileges %admin 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 

Some console commands output:

 $ id dart uid=1000(dart) gid=1000(dart) groups=1000(dart),24(cdrom),30(dip),46(plugdev),107(lpadmin),124(sambashare) $ sudo ls /root/ [sudo] password for dart: 

Why system asking password for sudo? How can I avoid it?

Answer 1

You're probably in the sudo or admin group, try putting the dart NOPASSWD: entry at the end of your sudoers file. Sudoers will match the last entry in the file which corresponds either to a user or a group, and as sudoers and admin come afterwards, and they ask for a password, so you're being prompted for a password.

Answer 2

this is very simple

omid ALL=(ALL) NOPASSWD: ALL 

put this command at end of file.(Important)

Answer 3

Here's mine and it works (don't ask me about details, though... I've had it for years on different machines and I simply copy and paste it). User needs to be in the "sudo" group.

# # 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 # Members of the admin group may gain root privileges %admin 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: # members of the sudo group don't have to enter the pass %sudo ALL=NOPASSWD: ALL #includedir /etc/sudoers.d