User is in the
/etc/sudoers file does have an entry
%sudo ALL=(ALL:ALL) ALL
But they still get the message:
user not in sudoers file. This incident will be reported.
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If you've just added the user to the sudo group, you need a fresh login into the OS. So you may log out and then log back again. Or you can use another tty to do the sudo task without logging in. (Try Ctrl+Alt+F1...F8.)
If you only guess the user is in the group, while in fact it is not, you need to run these two commands:
And now as root:
adduser user_name sudo
And now relog or log into another tty.