[Bug 1961541] [NEW] ubuntu daily isos fail to isoboot

[John Little]

Public bug reported:

>From about 2022-02-06, doing a grub isoboot into a jammy-desktop-amd64
iso loops outputting

    stdin: Not a typewriter

This is repeated about every 2 seconds, for about 2 minutes, then there
is a prompt

    Unable to find a medium containing a live file system

and a busybox prompt.  The casper log shows

    Begin: Running /scripts/casper-premount ... done.
    done.
    stdin: Not a typewriter

I've tried Ubuntu, Kubuntu and Lubuntu daily isos.  These all could
isoboot up to 2022-02-02 at least.

I wrote one of the daily isos to a USB stick, and it booted normally.
Using a Ventoy boot USB stick, which uses a different grub iso booting
method, fails.

Using a grub isoboot is much faster than writing an iso to a USB stick
then booting from that stick, and makes daily testing feasible.

(Any data "gathered" by ubuntu-bug is from the Kubuntu 21.10 system I'm
using to file this report, and are not relevant.)

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: syslinux (not installed)
ProcVersionSignature: Ubuntu 5.13.0-28.31-generic 5.13.19
Uname: Linux 5.13.0-28-generic x86_64
ApportVersion: 2.20.11-0ubuntu71
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Mon Feb 21 11:22:17 2022
InstallationDate: Installed on 2020-05-09 (652 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: syslinux
UpgradeStatus: Upgraded to impish on 2021-11-14 (98 days ago)

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


** Tags: amd64

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https://bugs.launchpad.net/bugs/1961541

Title:
  ubuntu daily isos fail to isoboot

Status in syslinux package in Ubuntu:
  New

Bug description:
  From about 2022-02-06, doing a grub isoboot into a jammy-desktop-amd64
  iso loops outputting

      stdin: Not a typewriter

  This is repeated about every 2 seconds, for about 2 minutes, then
  there is a prompt

      Unable to find a medium containing a live file system

  and a busybox prompt.  The casper log shows

      Begin: Running /scripts/casper-premount ... done.
      done.
      stdin: Not a typewriter

  I've tried Ubuntu, Kubuntu and Lubuntu daily isos.  These all could
  isoboot up to 2022-02-02 at least.

  I wrote one of the daily isos to a USB stick, and it booted normally.
  Using a Ventoy boot USB stick, which uses a different grub iso booting
  method, fails.

  Using a grub isoboot is much faster than writing an iso to a USB stick
  then booting from that stick, and makes daily testing feasible.

  (Any data "gathered" by ubuntu-bug is from the Kubuntu 21.10 system
  I'm using to file this report, and are not relevant.)

  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: syslinux (not installed)
  ProcVersionSignature: Ubuntu 5.13.0-28.31-generic 5.13.19
  Uname: Linux 5.13.0-28-generic x86_64
  ApportVersion: 2.20.11-0ubuntu71
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: KDE
  Date: Mon Feb 21 11:22:17 2022
  InstallationDate: Installed on 2020-05-09 (652 days ago)
  InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  SourcePackage: syslinux
  UpgradeStatus: Upgraded to impish on 2021-11-14 (98 days ago)

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