Ubuntu “a user name is not in the sudoer folder. It will be reported. ” Solutions for

If the user name was not created when the system was installed, this problem occurs when using the sudo command.

Solution: input

su

Enter the root password. If you have not set the root password before, please visit the URL settings.
http://blog.csdn.net/baidu_ 27280587/article/details/53285620

After entering the successful root environment, enter

gedit /etc/sudoer

After opening the file, find the

root	ALL=(ALL:ALL) ALL

In this line, add the same line below it, and change root to your user name. Save and close the file, and then use the sudo command, no more errors will be reported.