@Anthony, you can try focal kernel directly on your Bionic installation
first.

  $ printf "deb http://archive.ubuntu.com/ubuntu/ focal main restricted 
universe multiverse\ndeb http://archive.ubuntu.com/ubuntu/ focal-updates main 
restricted universe multiverse\n" > /etc/apt/sources.list.d/focal.list
  $ sudo apt update
  $ sudo apt install linux-modules-extra-5.4.0-26-generic linux-firmware/focal

And, it seems an upstream fix commit 979923871f69 ("x86/timer: Don't
skip PIT setup when APIC is disabled or in legacy mode") has been
backported to v5.4.19 and therefore focal kernel included that in bug
1863588 since at least 5.4.0-15. So it should be fine for you to use
focal kernel now.

Or, maybe you don't bother upgrade kernels from Focal. Just use 5.3
kernels from Bionic, as they should have the same fix since 5.3.0-46.

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: linux (Ubuntu Bionic)
     Assignee: (unassigned) => You-Sheng Yang (vicamo)

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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1856387

Title:
  Freezing on boot since kernel 4.15.0-72-generic release

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Bionic:
  In Progress

Bug description:
  After the update to install kernel 4.15.0-72-generic (a bit over a week ago) 
my computer will not boot. On boot, all I see is the purple screen with:
  Loading Linux 4.15.0-72-generic ...
  Loading initial ramdisk ...
  and nothing happens. Just sits there. I've waited about 5-10 minutes on 
occasion but to no avail.
  I've checked a number of logs in /var/log but not found anything.

  If I go into the advanced options and select kernel
  4.15.0-70-generic, the computer boots normally.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-72-generic 4.15.0-72.81
  ProcVersionSignature: Ubuntu 4.15.0-70.79-generic 4.15.18
  Uname: Linux 4.15.0-70-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.9
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  tony       1977 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Dec 14 21:53:14 2019
  HibernationDevice: RESUME=UUID=5475ce25-e091-45e2-9811-9b5cddc08dd1
  InstallationDate: Installed on 2018-09-16 (454 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 04f2:b59e Chicony Electronics Co., Ltd 
   Bus 001 Device 002: ID 046d:c063 Logitech, Inc. DELL Laser Mouse
   Bus 001 Device 004: ID 8087:0aaa Intel Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: GIGABYTE Sabre 17WV8
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-70-generic 
root=UUID=9455257c-d3b7-4d61-853d-ab0b0ee40013 ro acpi=off
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-70-generic N/A
   linux-backports-modules-4.15.0-70-generic  N/A
   linux-firmware                             1.173.13
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/22/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F05
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: Sabre 17WV8
  dmi.board.vendor: GIGABYTE
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: GIGABYTE
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF05:bd05/22/2018:svnGIGABYTE:pnSabre17WV8:pvrNotApplicable:rvnGIGABYTE:rnSabre17WV8:rvrNotApplicable:cvnGIGABYTE:ct10:cvrN/A:
  dmi.product.family: Sabre
  dmi.product.name: Sabre 17WV8
  dmi.product.version: Not Applicable
  dmi.sys.vendor: GIGABYTE

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