I can confirm this bug occurs with me aswell, though, I was doing some
maintenance in my computer yesterday and after replugging the power
cable of the monitor, instead of plugging it in my voltage stabilizer, I
plugged it in the computer's power supply, after using Ubuntu for
awhile, I locked the screen and noticed the bug was gone, Im not sure
why this worked but this was the workaround I (mistakenly) found

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Title:
  Login screen showing Authentication Failure Switch to greeter...

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