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

Status in gdm3 package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  AFter upgrade system shows graphic artefacts for a moment and then
  text cursor for about minute (it looks like hanged) and then starts.

  In 19.04 startup required 1 or 2 seconds.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: ubuntu-release-upgrader-core 1:19.10.15
  ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
  Uname: Linux 5.3.0-18-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Oct 17 17:42:27 2019
  InstallationDate: Installed on 2019-07-04 (104 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: dist-upgrade
  UpgradeStatus: Upgraded to eoan on 2019-10-17 (0 days ago)
  VarLogDistupgradeLspcitxt:
   
  VarLogDistupgradeXorgFixuplog:
   INFO:root:/usr/bin/do-release-upgrade running
   INFO:root:No xorg.conf, exiting
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  DistUpgraded: 2019-10-17 17:03:47,139 DEBUG Running PostInstallScript: 
'./xorg_fix_proprietary.py'
  DistroCodename: eoan
  DistroRelease: Ubuntu 19.10
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   
  InstallationDate: Installed on 2019-07-04 (105 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  Lspci:
   
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  MachineType: Microsoft Corporation Virtual Machine
  Package: xorg-server (not installed)
  ProcFB: 0 hyperv_fb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-18-generic 
root=UUID=17409d40-25e9-4051-9fd9-758e2a02ebc3 ro quiet splash 
video=hyperv_fb:1900x900 elevator=noop vt.handoff=7
  ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
  RelatedPackageVersions:
   linux-restricted-modules-5.3.0-18-generic N/A
   linux-backports-modules-5.3.0-18-generic  N/A
   linux-firmware                            1.183
  RfKill:
   
  Tags:  eoan ubuntu
  Uname: Linux 5.3.0-18-generic x86_64
  UpgradeStatus: Upgraded to eoan on 2019-10-17 (0 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 01/30/2019
  dmi.bios.vendor: Microsoft Corporation
  dmi.bios.version: Hyper-V UEFI Release v4.0
  dmi.board.asset.tag: None
  dmi.board.name: Virtual Machine
  dmi.board.vendor: Microsoft Corporation
  dmi.board.version: Hyper-V UEFI Release v4.0
  dmi.chassis.asset.tag: 2831-3616-6111-5725-4803-1162-28
  dmi.chassis.type: 3
  dmi.chassis.vendor: Microsoft Corporation
  dmi.chassis.version: Hyper-V UEFI Release v4.0
  dmi.modalias: 
dmi:bvnMicrosoftCorporation:bvrHyper-VUEFIReleasev4.0:bd01/30/2019:svnMicrosoftCorporation:pnVirtualMachine:pvrHyper-VUEFIReleasev4.0:rvnMicrosoftCorporation:rnVirtualMachine:rvrHyper-VUEFIReleasev4.0:cvnMicrosoftCorporation:ct3:cvrHyper-VUEFIReleasev4.0:
  dmi.product.family: Virtual Machine
  dmi.product.name: Virtual Machine
  dmi.product.sku: None
  dmi.product.version: Hyper-V UEFI Release v4.0
  dmi.sys.vendor: Microsoft Corporation
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.99-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.1-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20191008-0ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-1ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20190815-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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