Ubuntu 19.xx/20.xx hangs on splash screen during boot

The solution is to disable the splash screen during boot.

1. Open /etc/default/grub file in editor as superuser.
2. Find the following line:
   
   GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
 
3. Change quiet splash to quiet or nosplash.
4. Save the file and run the following command:
   
   sudo update-grub2

Source: How do I disable the boot splash screen, and only show kernel and boot text instead?