By default Ubuntu uses greeter gdm3 (e.g. 17.10, 18.04, 18.10).

Edit file /etc/alternatives/gdm3.css as root and adjust #lockDialGroup style:

#lockDialogGroup {
  background: #000 url(file:///usr/share/backgrounds/YOUR_FILE.jpg);        
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
}
Tagged as Ubuntu

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