how come sudo give root privileges for a user not in /etc/sudoers?

I just wonder how sudo privileges are found with ubuntu, from a technical point of view. Users with sudo privileges are not present in /etc/sudoers, so this looks a little bit exotic.

Was the source code of 'sudo' modified to look to other configuration files ?

Thanks

Solution 1:

By default all members of admin group can use sudo to get root privileges:

%admin ALL=(ALL) ALL

how come sudo give root privileges for a user not in /etc/sudoers?

Solution 1:

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