Are you using an nvidia card? I am thinking this sounds like bug
1705369.
Could you please provide output from running this command?; lspci -k
** Tags added: black-screen
** Changed in: gdm3 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1767606
Title:
GDM do not start on freshly installed 18.04
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