Cannot reproduce this very issue with the fallback Kernel.

Linux sisc-ws 5.4.0-33-generic #37-Ubuntu SMP Thu May 21 12:53:59 UTC
2020 x86_64 x86_64 x86_64 GNU/Linux

Instead, seeing some issues with nouveau. See attached dmesg output with
older kernel


** Attachment added: "dmesg_5.4.0-33-generic.log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1884899/+attachment/5386974/+files/dmesg_5.4.0-33-generic.log

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https://bugs.launchpad.net/bugs/1884899

Title:
  Kernel Oops - unable to handle kernel NULL pointer dereference; RIP is
  at 0010:set_root+0x27/0xc0

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After login into the gnome session, the session freezes, either
  instantly or after a few seconds ( only mouse is working ). The Oops
  does not occur on every startup. After a few restarts, the kernel Oops
  does not occur anymore during the complete session.

  Dell Perfomance Checks ( including memory checks ) did not show any
  failures. BIOS is uptodate ( 1.16.2 for Dell Precision 5530 ).

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-37-generic 5.4.0-37.41
  ProcVersionSignature: Ubuntu 5.4.0-37.41-generic 5.4.41
  Uname: Linux 5.4.0-37-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  scsi       3876 F.... pulseaudio
   /dev/snd/controlC1:  scsi       3876 F.... pulseaudio
   /dev/snd/controlC0:  scsi       3876 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Jun 24 09:00:05 2020
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-xenial-amd64-osp1-20171027-1
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2019-01-10 (530 days ago)
  InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 
20171027-10:57
  MachineType: Dell Inc. Precision 5530
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-37-generic 
root=UUID=2c719e60-4d36-4042-aa72-aa62403b19a1 ro acpi_osi=Linux-Dell-Video 
alx.enable_wol=1 mem_sleep_default=deep quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-37-generic N/A
   linux-backports-modules-5.4.0-37-generic  N/A
   linux-firmware                            1.187
  SourcePackage: linux
  UpgradeStatus: Upgraded to focal on 2020-05-04 (50 days ago)
  WifiSyslog:

  dmi.bios.date: 04/21/2020
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.16.2
  dmi.board.name: 0N0DK2
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.16.2:bd04/21/2020:svnDellInc.:pnPrecision5530:pvr:rvnDellInc.:rn0N0DK2:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: Precision
  dmi.product.name: Precision 5530
  dmi.product.sku: 087D
  dmi.sys.vendor: Dell Inc.

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