Public bug reported:

I have searched different forum and most of them suggested that it's a
graphics card issue.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7.1
ProcVersionSignature: Ubuntu 4.15.0-72.81-generic 4.15.18
Uname: Linux 4.15.0-72-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Mon Dec 16 13:11:43 2019
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 
09) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company 3rd Gen Core processor Graphics 
Controller [103c:17f6]
InstallationDate: Installed on 2016-11-05 (1135 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
MachineType: Hewlett-Packard HP ProBook 4540s
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-72-generic 
root=UUID=ffb012cd-6e09-453a-adcb-2370a8a9e10f ro quiet splash vt.handoff=1
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/11/2019
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68IRR Ver. F.68
dmi.board.name: 17F6
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 58.21
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68IRRVer.F.68:bd04/11/2019:svnHewlett-Packard:pnHPProBook4540s:pvrA1018C1100:rvnHewlett-Packard:rn17F6:rvrKBCVersion58.21:cvnHewlett-Packard:ct10:cvr:
dmi.product.family: 103C_5336AN G=N L=BUS B=HP S=PRO
dmi.product.name: HP ProBook 4540s
dmi.product.version: A1018C1100
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
version.libdrm2: libdrm2 2.4.97-1ubuntu1~18.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 19.0.8-0ubuntu0~18.04.3
version.libgl1-mesa-glx: libgl1-mesa-glx 19.0.8-0ubuntu0~18.04.3
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
xserver.bootTime: Mon Dec 16 12:48:38 2019
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.19.6-1ubuntu4.3

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic ubuntu

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https://bugs.launchpad.net/bugs/1856521

Title:
  screen keeps flashing on startup

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