Public bug reported:

I have an DVI-I to VGA adapter on my videocard. Usually I just need to
put video=1440x900 because the linux kernel fails to recognize the
correct resolution, but I couldn't make it display on the screen even
setting video=DVI-I:1440x900. I believe it switches to HDMI because I
could experience no issues like this on my television.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-13-generic 4.15.0-13.14 [modified: 
boot/vmlinuz-4.15.0-13-generic]
ProcVersionSignature: hostname 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  lucio      1485 F.... pulseaudio
 /dev/snd/controlC1:  lucio      1485 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Sun Apr  8 19:40:31 2018
InstallationDate: Installed on 2018-04-08 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcFB:
 
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic 
root=UUID=db8a4afa-dec3-45b6-a84f-9a702c6f96ad ro quiet splash nomodeset
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-13-generic N/A
 linux-backports-modules-4.15.0-13-generic  N/A
 linux-firmware                             1.173
RfKill:
 0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/09/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.20
dmi.board.name: 980DE3/U3S3
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP1.20:bd04/09/2013:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rn980DE3/U3S3:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug bionic

** Attachment added: "/var/log"
   
https://bugs.launchpad.net/bugs/1762259/+attachment/5107320/+files/logs.tar.gz

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https://bugs.launchpad.net/bugs/1762259

Title:
  Ubuntu 18.04 is not booting without adding the nomodeset parameter to
  the linux commandline

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