[Bug 1811827] [NEW] Ubuntu 19.04 live USB fails to boot on optimus system with CPU soft lockups

[Rocko]

Public bug reported:

The default configuration of the 19.04 live USB (as of 2018-01-14) fails
to boot on my optimus system - it locks up with CPU soft lockups on
multiple CPUs unless I manually edit the grub boot to add
modprobe.blacklist=nouveau.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: ubiquity 19.04.4
ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
Uname: Linux 4.18.0-11-generic x86_64
ApportVersion: 2.20.10-0ubuntu18
Architecture: amd64
CasperVersion: 1.401
CurrentDesktop: ubuntu:GNOME
Date: Tue Jan 15 14:02:35 2019
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz modprobe.blacklist=nouveau file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190112)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug disco ubuntu

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https://bugs.launchpad.net/bugs/1811827

Title:
  Ubuntu 19.04 live USB fails to boot on optimus system with CPU soft
  lockups

Status in ubiquity package in Ubuntu:
  New

Bug description:
  The default configuration of the 19.04 live USB (as of 2018-01-14)
  fails to boot on my optimus system - it locks up with CPU soft lockups
  on multiple CPUs unless I manually edit the grub boot to add
  modprobe.blacklist=nouveau.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: ubiquity 19.04.4
  ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
  Uname: Linux 4.18.0-11-generic x86_64
  ApportVersion: 2.20.10-0ubuntu18
  Architecture: amd64
  CasperVersion: 1.401
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Jan 15 14:02:35 2019
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz modprobe.blacklist=nouveau file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
  LiveMediaBuild: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190112)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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