This sounds like bug 1872159...
Please try editing /etc/default/grub and remove the word "splash". Then
run:
sudo update-grub
and reboot. Now can you boot with the monitor connected?
** Summary changed:
- 20.4 - hybrid-graphics
+ (If external monitor connected) Hang on boot while showing ubuntu boot screen
with animation
** Package changed: xorg (Ubuntu) => plymouth (Ubuntu)
** Tags added: multimonitor
** Tags removed: multimonitor
** Tags added: mulimonitor
** Changed in: plymouth (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1878421
Title:
(If external monitor connected) Hang on boot while showing ubuntu boot
screen with animation
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