Ubuntu vi Input Direction key will become ABCD solution

1. Turn on the root user

First, set a password for the root user:

sudo passwd root

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2. Log in with the root user

$ sudo vi /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf

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At the end of the increase greeter-show-manual-login=true
Save exit. After logging out you can see the login box is displayed, you can enter the user name.

3. Turn off the Guest user

$ sudo vi /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf

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At the end of the increase allow-guest=false
Save exit. After logging out, you can see that there are no guest user login options.

Ubuntu vi Input Direction key will become ABCD solution