If it helps, I've reproduced this in a fresh Ubuntu Mate virtual
machine.

1. Install Ubuntu Mate following all the usual steps until you get to the 
account creation screen.
2. Create a user account with a password and leave "require password at login" 
checked.
3. Finish installation and reboot.
4. Go to "System" -> "Administration" -> "Users and Groups".
5. Change password from "Asked on logon" to "Not asked on logon".
6. Lock your machine.
7. Press "Switch User".
8. Observe no password is required to unlock as the current user.

For some reason, the problem doesn't happen when you set your account to
not require a password at installation. Even more oddly, the user
account still shows "Asked on logon" for the user created at
installation, even though the option to not require a password was
checked, and seems to be effective at boot. I guess they must just be
implemented in different ways.

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https://bugs.launchpad.net/bugs/1706770

Title:
  Lock screen can be bypassed when auto-login is enabled.

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