I am having this same issue on my Lenovo X220. Using Ubuntu 20.04.1 LTS.
I am able to boot by disabling the splash screen using:

BOOT_IMAGE=/boot/vmlinuz-5.4.0-51-generic
root=UUID=70d5c302-0fe3-4a83-9076-ca834b973ac3 ro nosplash

I am using the stock kernel:

Linux version 5.4.0-51-generic (buildd@lcy01-amd64-020) (gcc version
9.3.0 (Ubuntu 9.3.0-10ubuntu2)) #56-Ubuntu SMP Mon Oct 5 14:28:49 UTC
2020

I have not tried "nomodeset".

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https://bugs.launchpad.net/bugs/1877889

Title:
  Intermittent hangs on boot Ubuntu 20.04 on Lenovo E595

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