Hi M, I can not reproduce the issue: just now I downloaded
http://dt0cinyuc0rrg.cloudfront.net/ubuntu-19.10-desktop-amd64.iso and
created a Generation-2 VM on Hyper-V with the .iso file. The VM boots up
fast: it boots up to the Xorg desktop in 28 seconds with 1 CPU and 2GB
memory, and in 21 seconds with 8 CPUs and 8GB memory.

I don't see anything unusual.

I believe you're also using Generation-2 VM since your "lspci" returns
nothing.

FYI: I got the below in my VM:

decui@decui-u1910-gen2:~$ uname -a
Linux decui-u1910-gen2 5.0.0-32-generic #34-Ubuntu SMP Wed Oct 2 02:06:48 UTC 
2019 x86_64 x86_64 x86_64 GNU/Linux

decui@decui-u1910-gen2:~$ dmesg | grep "Hyper-V Host Build"
[    0.000000] Hyper-V Host Build:18928-10.0-1-0.1044

decui@decui-u1910-gen2:~$ systemd-analyze
Startup finished in 303ms (firmware) + 663ms (loader) + 1.087s (kernel) + 
35.041s (userspace) = 37.096s
graphical.target reached after 34.963s in userspace

decui@decui-u1910-gen2:~$ systemd-analyze blame
         31.530s plymouth-quit-wait.service
         10.598s gdm.service
          1.817s dev-sda2.device
           944ms networkd-dispatcher.service
           866ms NetworkManager-wait-online.service
          .....

decui@decui-u1910-gen2:~$  systemd-analyze critical-chain
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.

graphical.target @34.963s
└─multi-user.target @34.963s
  └─kerneloops.service @4.213s +34ms
    └─network-online.target @4.170s
      └─NetworkManager-wait-online.service @3.301s +866ms
        └─NetworkManager.service @2.983s +317ms
          └─dbus.service @2.912s
            └─basic.target @2.765s
              └─sockets.target @2.765s
                └─snapd.socket @2.754s +10ms
                  └─sysinit.target @2.731s
                    └─apparmor.service @2.199s +530ms
                      └─local-fs.target @2.173s
                        └─run-user-1000-gvfs.mount @17.395s
                          └─run-user-1000.mount @14.119s
                            └─local-fs-pre.target @456ms
                              └─keyboard-setup.service @223ms +232ms
                                └─systemd-journald.socket @218ms
                                  └─-.mount @206ms
                                    └─system.slice @206ms
                                      └─-.slice @206ms

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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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