[Bug 1961541] Re: ubuntu daily isos fail to isoboot

[Chris Guiver]

Thank you for taking the time to report this bug and helping to make
Ubuntu better.

> 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.


That implies to me the bug exists in `ventoy` which is not a supported Ubuntu tool.

Supported methods are described in documentation as follows
- https://ubuntu.com/tutorials/tutorial-create-a-usb-stick-on-ubuntu#1-overview
- https://ubuntu.com/tutorials/tutorial-create-a-usb-stick-on-macos#1-overview
- https://ubuntu.com/tutorials/tutorial-create-a-usb-stick-on-windows#1-overview
where you'll note no mention is made of `ventoy`.

The error you mention "Unable to find a medium containing a live file
system" implies either an invalid ISO (did you validate it) OR bad write
to media (thus it couldn't be found).

You do mention 2022-02-02 works; which made me think of
https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1960226 so maybe
you've just found this older bug (which has since been fixed) and
mention 2022-02-06 daily fails (which was impacted by the aforementioned
bug),

so could this bug be a re-filing of
https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1960226 which has
been fixed.

I'll mark this bug incomplete; due to 
(a) use of unsupported `ventoy`; bug is likely with outdated ventoy that can't deal with newer ISOs
(b) possible duplicate of provided bug report (which has been fixed),
but I believe the issue is the ventoy you're using is OUTDATED & needs updating to reflect changes in the aforementioned bug report due to changes; that is not a Ubuntu issue, with bug needing to be raised against ventoy.

If you believe I'm incorrect, please leave a comment explaining why, and
the bug report can be returned to "New".

** Changed in: syslinux (Ubuntu)
       Status: New => Incomplete

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

Title:
  ubuntu daily isos fail to isoboot

Status in syslinux package in Ubuntu:
  Incomplete

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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