Today I installed a Generation-2 VM (4 virtual CPUS, 4 GB memory) from the this 
.iso file: 
http://releases.ubuntu.com/19.10/ubuntu-19.10-desktop-amd64.iso.

My host is Win10: Version 1909 (OS Build 18383.720) -- I got the info by
running the built-in "winver.exe" program.

The CPU type is Intel Core I7-7600 (2.80G Hz). There are 2 cores and the
cores support SMT, so there are 4 logical processors in total.

I can see the "graphic artifact" (I will upload a screenshot soon), but
it looks overall the boot-up is fast (it takes 30 seconds) and it looks
the VM works fine for me.

When the VM boots up:
1. First, the screen with the purple background (I think it's from grub) 
remains 4 seconds.
2. The screen background becomes black, and there is a "Hyper-V" logo in the 
center of the screen. This remains about 1 second.
3. The screen with the "graphic artifact" appears, and remains about 4 seconds.
4. The screen background becomes purple and the "Ubuntu" logo with 5 dots 
appears. This screen remains 8 seconds.
5. The screen becomes completely black. This screen remains 9 seconds.
6. The screen becomes kind of purple again, and in about 2 seconds the GUI 
desktop appears (I set Ubuntu to automatically login in to the desktop). 

So the overall time spent on the 6 steps are 30 seconds. IMO this looks
normal.

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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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