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(Get the code!)
Just for the record: I had Ubuntu 17.10 (upgraded from 17.04 which was upgraded from 16.10) running on my HP Spectre x360 just fine with GDM3 and Unity and when the screensaver kicked in or I locked the screen, it turned to the GDM3 greeter.
A few days ago, I cleared my SSD and installed 17.10 from scratch. But now, when I lock the screen, I see what looks like the LightDM greeter with a red "Authentication failed" message and "Switch to greeter..." where the password input should be. I then have to Ctrl+Alt+F1 to the GDM3 greeter and unlock from there. Why is that?