With debug enabled, I restarted the computer and followed the same steps
with workaround. Attached logs.

** Attachment added: "logs by 'journalctl -b 0'"
   
https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1878838/+attachment/5372016/+files/journaldebug.txt

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https://bugs.launchpad.net/bugs/1878838

Title:
  [nvidia] Black screen (wrong VT) upon login

Status in gdm3 package in Ubuntu:
  Incomplete
Status in gnome-shell package in Ubuntu:
  New
Status in nvidia-graphics-drivers-440 package in Ubuntu:
  New

Bug description:
  OS: Fresh install of ubuntu 20.04

  Steps:

  1. Enter password to login (Black screen is shown)

  Workaround:

  2. After blank screen is shown, press Ctrl+Alt+F3. (It'll show terminal with 
login prompt)
  3. Don't login, simply press Ctrl+Alt+F2. (Now desktop is shown, black screen 
is gone)

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
  Uname: Linux 5.4.0-29-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.suspend: suspend hibernate resume
  .proc.driver.nvidia.suspend_depth: default modeset uvm
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  440.64  Fri Feb 21 01:17:26 
UTC 2020
   GCC version:
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Fri May 15 14:08:29 2020
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   NVIDIA Corporation GP106 [GeForce GTX 1060 3GB] [10de:1c02] (rev a1) 
(prog-if 00 [VGA controller])
     Subsystem: ZOTAC International (MCO) Ltd. GP106 [GeForce GTX 1060 3GB] 
[19da:2438]
  InstallationDate: Installed on 2020-04-28 (16 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  MachineType: System manufacturer System Product Name
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-29-generic 
root=UUID=2a627b38-a2bd-4bec-9551-703eab56e5da ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/21/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0801
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H61M-K
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0801:bd07/21/2014:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH61M-K:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.sku: SKU
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.101-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20200226-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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