I would suggest that you create a new Admin user, Log in as that user and verify it works. Delete the Company create user.

Disabling the automatic login has several paths to execution. https://unix.stackexchange.com/questions/45573/how-to-disable-auto-login-in-linux-mint

On Wed, Jun 20, 2018 at 10:38 PM Victor Odhner <vodhner@cox.net> wrote:
A vendor loaded Tom's new PC with Mint Cinnamon. It powers up without authentication to a default user account. How do we disable that?

The details:

It was set up with one temporary admin user, named “user”, with password “password.”

So we set up the “tom” account, with admin status, and then made “user” an ordinary user with its permissions turned off, and a serious password.

We ran fine as “tom”, but when we shut down and restarted, it came right up as “user” without authentication.

We can log out of the “user” session and we get the login dialog so we can get to the “tom” account.

We could remove “user,” but I thought it might hang up looking for that account.

I did some web searching and they referred to two config files to be adjusted, but one didn’t exist and the other had only one line which wasn’t relevant to the issue.

Any suggestions?

Thanks,
Victor

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