youqiao is not in the sudoers file. This incident will be reported.

Being added to the sudoers file allows a user to execute commands with administrative privileges. If you encounter the message "youqiao is not in the sudoers file," it means that the user "youqiao" does not have the necessary permissions to execute commands with sudo.

To resolve this issue, you need to have access to an account with administrative privileges. Log in as an administrator and use the following command to add "youqiao" to the sudoers file:

sudo visudo

This command will open the sudoers file in a text editor. Look for the line that says "%sudo ALL=(ALL:ALL) ALL" and add the following line below it:

youqiao ALL=(ALL:ALL) ALL

Save the changes and exit the text editor. Now, the user "youqiao" should have sudo privileges. If you don't have access to an administrator account, contact your system administrator for assistance.