Hello,
Same bug affects me, I'm running 20.04 on a Lenovo E580. Intel drivers, no 
nvdia gpu.
I have a usb-c dock, hdmi is connected to the dock and usb-c cable from dock to 
laptop. Lenovo E580 has only one usb-c port, so the only way to boot is startup 
on battery, after the login I can plug the dock in and Ubuntu detects the 
monitor and other dock ports normally.
Thanks.

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https://bugs.launchpad.net/bugs/1874194

Title:
  Ubuntu 20.04 HDMI connected, no boot

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