Black screen
I'm using 19.04 via Pop!_OS. There does seem to be an issue with this but, during boot up press the F2 key and you'll see that it gets stuck on a startup task, if you leave it for about 5 mins you'll eventually see that it kind of hangs, at this point press CTRL + ALT + F2 and then CTRL + ALT + F1 and the Gnome GDM will load just fine.
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