Pressing ESC or F1 does nothing in the hanging purple screen. (I now got
the error again.)

Editing the grub "ubuntu" menu entry to ro nomodeset did nothing,
altough doing the same for a recovery entry did the job of getting to
boot properly.

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https://bugs.launchpad.net/bugs/1829402

Title:
  Purple screen hangup during boot

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Specs:
  Ubuntu 19.04 fresh install, everything updated
  Firmware is latest (Bios version 300)
  Asus vivobook s14 
  LVM disk encryption

  Steps to reproduce:
  - Install ubuntu 19.04/18.10
  - Reboot
  - Purple screen indefinitely

  Setting kernel cmdline args only to ro nomodeset seems solves it.

  After some debugging session with #ubuntu with different cmdline args,
  it seems now the default one works too. I have not edited anything,
  but now i am unable to reproduce it.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: linux-image-5.0.0-15-generic 5.0.0-15.16
  ProcVersionSignature: Ubuntu 5.0.0-15.16-generic 5.0.6
  Uname: Linux 5.0.0-15-generic x86_64
  ApportVersion: 2.20.10-0ubuntu27
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  markbartos   1778 F.... pulseaudio
  Date: Thu May 16 17:15:07 2019
  InstallationDate: Installed on 2019-05-16 (0 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 13d3:3526 IMC Networks 
   Bus 001 Device 002: ID 13d3:56c1 IMC Networks 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. VivoBook_ASUSLaptop X430FA_S430FA
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.0.0-15-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-5.0.0-15-generic N/A
   linux-backports-modules-5.0.0-15-generic  N/A
   linux-firmware                            1.178.1
  SourcePackage: linux
  StagingDrivers: r8822be
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/22/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X430FA.300
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X430FA
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrX430FA.300:bd11/22/2018:svnASUSTeKCOMPUTERINC.:pnVivoBook_ASUSLaptopX430FA_S430FA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX430FA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.family: VivoBook
  dmi.product.name: VivoBook_ASUSLaptop X430FA_S430FA
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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