Ubuntu version, executes the sudo command prompt under the general user, the user is isn't in the sudoers file. This incident would be reported. Solution:
First, $where is sudoers-Find the location of the file, the default is/etc/sudoers
Second, #chmod U+w/etc/sudoers to the Super User login su-root, modify file permissions that add files have the Write permission limit, ls-al/etc/sudoers can view the original file permissions.
Vim/etc/sudoers edit the file and add the xxx all= (All) all,xxx to your username under root all= (All). Add method: Locate root row, press "I" key to enter edit mode to add. After editing the ESC key into the general mode, ": w!", ": q!" Save exit.
Finally, #chmod U-w/etc/sudoers back to the original permissions of the file.
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