Please try:

1. Disabling visual bell in Settings > Universal Access > Hearing >
Visual Alerts = Off

2. Select 'Ubuntu on Wayland' from the login screen. Does that avoid the
issue?

3. Next time the problem starts happening run:

   journalctl -b0 > journal.txt

   and then attach the resulting file here.

** Package changed: xorg (Ubuntu) => ubuntu

** Changed in: ubuntu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1876487

Title:
  The screen is blinking at a random time

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