[Bug 1862527] [NEW] Lubuntu 20.04 daily build (2020-02-08) Won't boot LiveUSB

[MarkF]

Public bug reported:

When choosing the first Grub option to start Lubuntu, I immediately get
the error and it hangs:

    [0:nnnnnn] pci: 0000:00:00.2 AMD-ViL Unable to write to IOMMU perf
counter.

    - Choosing the Grub option to "check disc for defects," results in
the same error/hang.

    - Choosing safe mode works (and is from which I submitted this bug
report)

Laptop: Acer Aspire 5 (A515-43-R19L, bios 1.06) with Ryzen 3 3200u
(Radeon Vega 3 gfx)

Note: This laptop has successfully installed 20 or so distros. In one
case using (Sparky Linux's dev/test ISO) it installed fine with the 5.3
kernel. But, when I performed the system update, it gave me kernel 5.4
which booted, but wouldn't startx. Choosing 5.3 from the Grub menu
booted fine again.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: syslinux 3:6.04~git20190206.bf6db5b4+dfsg1-2
ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
Uname: Linux 5.4.0-12-generic x86_64
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
CasperVersion: 1.438build1
CurrentDesktop: LXQt
Date: Sun Feb  9 16:13:57 2020
LiveMediaBuild: Lubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200208)
SourcePackage: syslinux
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1862527

Title:
  Lubuntu 20.04 daily build (2020-02-08) Won't boot LiveUSB

Status in syslinux package in Ubuntu:
  New

Bug description:
  When choosing the first Grub option to start Lubuntu, I immediately
  get the error and it hangs:

      [0:nnnnnn] pci: 0000:00:00.2 AMD-ViL Unable to write to IOMMU perf
  counter.

      - Choosing the Grub option to "check disc for defects," results in
  the same error/hang.

      - Choosing safe mode works (and is from which I submitted this bug
  report)

  Laptop: Acer Aspire 5 (A515-43-R19L, bios 1.06) with Ryzen 3 3200u
  (Radeon Vega 3 gfx)

  Note: This laptop has successfully installed 20 or so distros. In one
  case using (Sparky Linux's dev/test ISO) it installed fine with the
  5.3 kernel. But, when I performed the system update, it gave me kernel
  5.4 which booted, but wouldn't startx. Choosing 5.3 from the Grub menu
  booted fine again.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: syslinux 3:6.04~git20190206.bf6db5b4+dfsg1-2
  ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
  Uname: Linux 5.4.0-12-generic x86_64
  ApportVersion: 2.20.11-0ubuntu16
  Architecture: amd64
  CasperVersion: 1.438build1
  CurrentDesktop: LXQt
  Date: Sun Feb  9 16:13:57 2020
  LiveMediaBuild: Lubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200208)
  SourcePackage: syslinux
  UpgradeStatus: No upgrade log present (probably fresh install)

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