is not in the sudoers file. This incident code example

Example 1: steam is not in the sudoers file.

1. 	Open sudoers file using command : sudo nano /etc/sudoers

2. 	Then add 
	"YourUsername ALL=(ALL)  ALL" 
	below the root user

Example 2: is not in the sudoers file. This incident will be reported.

usermod -a -G sudo user
or
usermod -a -G wheel user