This sounds kind of like bug 1872159 or bug 1871641.
Can you please try editing /etc/default/grub and remove 'splash' then:
sudo update-grub
and reboot.
** Tags added: hybrid nvidia
** Summary changed:
- Xorg freeze
+ [nvidia] Boot freeze - can't get to login screen without unplugging HDMI first
** Package changed: xorg (Ubuntu) => plymouth (Ubuntu)
** Changed in: plymouth (Ubuntu)
Status: New => Incomplete
** Also affects: gdm3 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1890593
Title:
[nvidia] Boot freeze - can't get to login screen without unplugging
HDMI first
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