xxx is not in the sudoers file.This incident will be reported. 解决方法

1. Switch to the root user

2. Add the sudo file write permissions

　　Execute the command: chmod + U w / etc / sudoers

3. Edit the sudoers file

Execute the command: vi / etc / sudoers

Find the line root ALL = (ALL) ALL

Add this line below xxx ALL = (ALL) ALL (xxx is your user name)

Note: You can add any of the following four lines line:
youuser ALL = (ALL) ALL
% youuser ALL = (ALL) ALL
youuser ALL = ( ALL) the NOPASSWD: ALL
% youuser ALL = (ALL) the NOPASSWD: ALL

The first line: allows the user to execute youuser sudo command (password required).
The second line: allows the user to perform user group youuser inside sudo command (password required).
Third row: sudo command allows the user to execute youuser (no password).
Fourth row: which allows the user to group youuser sudo command performed by the user (no password).

4. revocation of write access to the file sudoers

　　Execute the command: chmod uw / etc / sudoers