Ubuntu – How to add a new user as sudoer using the command line

command linesudouser-management

After I add a user using adduser, I can't see it via System > Administration > Users and Groups unless I log out and then log in again. Is that normal?

Also, can I set a newly added user as a sudoer or do I have to change that only after adding it? How can I do that via the shell?

Finally, can I delete the original user that was created upon initial installation of Ubuntu, or is this user somehow 'special'?

Best Answer

  • Just add the user to the sudo group:

    sudo adduser <username> sudo

    The change will take effect the next time the user logs in.

    This works because /etc/sudoers is pre-configured to grant permissions to all members of this group (You should not have to make any changes to this):

    # Allow members of group sudo to execute any command
    %sudo   ALL=(ALL:ALL) ALL

    As long as you have access to a user that is in the same groups as your "original" user, you can delete the old one.

    Realistically, there are also other groups your new user should be a member of. If you set the Account type of a user to Administrator in Users Settings, it will be placed in at least all of these groups:

    adm sudo lpadmin sambashare

    Because your system configuration may vary, I suggest taking a look at the output of groups <username> to see what groups are normally in use.

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