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ubuntu doesnot diplay the login screen when "join display" is select and there is only one monitor

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I spent a night to debug why the login screen is not showing up. I was able to blindly type in my password to login to a colored background but empty screen.

The problem persisted after I upgraded the system from 18.04 to 20.04.

When the screen wakes up from an idle state, the login GUI does show up and everything was normal.

one problem I have found was that display setting was configured to "join display" even though I had only one monitor. After setting it to "single display", I can now see the desktop icons.

But after rebooting, I still don't see the login-screen.

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