[Bug 1922342] Re: Impish live session takes ages to boot on BIOS systems

[Thomas Schmitt]

Hi,

the fix for #1977644 does not solve the problem of #1922342. It only reduces
the need for ISO patching to a single operation which can be done on the
ISO image file before putting it onto a USB stick (and not a second time
directly on /dev/sdX after the first boot):

  # Patch the ISO already as image on hard disk
  ISO=ubuntu-22.04-desktop-amd64.iso
  dd if=/dev/zero bs=1 count=16 of="$ISO" conv=notrunc seek=462

I think that #1922342 can only be considered solved if the users of Ubuntu
ISOs can easily find this procedure and an explanation when it should be
applied.
My proposal would be to put a brief hint into
  https://ubuntu.com/tutorials/install-ubuntu-desktop#4-boot-from-usb-flash-drive
and to add a new page
  https://ubuntu.com/tutorials/remove-boot-flag-from-iso
which gives details.

The brief hint would be like:

  "On some very old and meanwhile rare machines it can last 8 minutes or
   longer until you see this welcome screen.
   If you plan just a single installation then simply wait until the screen
   appears.
   But if you plan to repeatedly use the "Try Ubuntu" offer on such an old
   machine, then see [link to new page tutorials/remove-boot-flag-from-iso]
   for a way to substantially shorten this time span."

Does anybody here know how to contact the custodians of the tutorials ?

Have a nice day :)

Thomas

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https://bugs.launchpad.net/bugs/1922342

Title:
  Impish live session takes ages to boot on BIOS systems

Status in Release Notes for Ubuntu:
  Fix Committed
Status in casper package in Ubuntu:
  Fix Released
Status in casper source package in Impish:
  Won't Fix
Status in casper source package in Kinetic:
  Fix Released

Bug description:
  First of all, I change the description of this bug because, thanks to
  Chris Guiver comments, I could check that the live session effectively
  works but it takes too long to complete. That's why I change the
  description of the bug from live session does not boot to live session
  takes ages to boot. I hope this is the best approach to this.

  I think the problem is the same as described here:
  https://discourse.ubuntubudgie.org/t/20-10-grub-error-can-t-find-
  command-grub-platform/4292. I can see prior to grub menu, briefly, the
  same error: Error can't find grub_platform. After the solution
  described below, this error is not showed and the system is able to
  boot.

  I try making the live usb using startup disk creator and with gnome-
  disks --> Restore disk image and get the same results.

  The live-usb has a gpt partition table instead of mbr like 20.04 live-
  usb has. That implies, I think, that the first one does not boot on
  BIOS systems and the second does.

  I try the same live-usb on an EFI laptop and it boots perfectly
  (perhaps it takes long time, but more less than in this case.

  If I try the solution described here:
  https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1905491/comments/8
  then it works.

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: casper 1.461
  ProcVersionSignature: Ubuntu 5.11.0-13.14-generic 5.11.7
  Uname: Linux 5.11.0-13-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu61
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.461
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Apr  2 09:55:24 2021
  LiveMediaBuild: Ubuntu 21.04 "Hirsute Hippo" - Beta amd64 (20210331.1)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=gl_ES.UTF-8
   SHELL=/bin/bash
  SourcePackage: casper
  UpgradeStatus: No upgrade log present (probably fresh install)

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