I created a Ubuntu 19.10 VM via "Quick Create..." and still can not
reproduce the long delay of > 1 minute: the VM can boot up to the Xorg
GUI desktop in 26 seconds.

My Windows 10 has the same version info: Version 1909 (OS Build
18363.778).

At the grub screen, can you press 'e' and, manually edit the kernel
parameter: please remove the "quiet splash $vt_handoff" and add
"ignore_loglevel sysrq_always_enabled". You may want to enable the
serial console logging by adding the kernel parameter "console=ttyS0",
and attach putty (Run as Administrator) to the named pipe
\\.\pipe\debug_slow_vm, assuming you configure the VM serial console by
"Set-VMComPort -VMName your_vm_name -number 1 -path
\\.\pipe\debug_slow_vm").

This way, you should get more messages on the VM serial console when the
VM boots up. When you see the long delay, you can press SysRQ+w (i.e.
the Right Alt + SysRq + w) to show the blocked processes, if any. This
may provide more info about the long delay. BTW, here I assume your have
a keyboard that has the SysRq key. :-)

It looks systemd can be configured to use "--log-level=debug --default-
standard-output=kmsg --default-standard-error=kmsg", which may provide
more info as well, if we check 'dmesg' and/or the VM serial console.

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https://bugs.launchpad.net/bugs/1848534

Title:
  [Microsoft Hyper-V guest] System shows graphic artifacts for a moment,
  then text cursor for about minute and then starts

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