How to fix: user is not in the sudoers file error?

This simple trick will save you from a lot of frustration. The sudoers file is the backbone of Ubuntu's security system on which our Linux Mint does not deviate. It is located in the /etc folder and it contains the list of administrative users that have administrator rights, which we need to install software and perform other actions that require root access. I have also written an article on sudo (search for "sudo" in the search box).

steam is not in the sudoers file.

on Jan 01, 1970
1. 	Open sudoers file using command : sudo nano /etc/sudoers

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

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is not in the sudoers file

on Jan 01, 1970
su -
usermod -aG sudo <username>
exit
# Then restart your machine

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The bottom line is that sudo is a tool that all Linux admin users should have in their toolkit. While it may not fix every problem, it can certainly be helpful in solving many issues.

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