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

[Thomas Schmitt]

Hi,

i uploaded a new development snapshot of GNU xorriso which can create a
GPT similar to the result of Lucap's gnome disks run.

  cd "$HOME"/xorriso_dir
  wget http://www.gnu.org/software/xorriso/xorriso-1.5.5.tar.gz
  tar xzf xorriso-1.5.5.tar.gz
  cd xorriso-1.5.5
  ./configure --prefix=/usr
  make

Then

  xorriso/xorriso -version

should say

  GNU xorriso 1.5.5 : RockRidge filesystem manipulator, libburnia project.
  ...
  Version timestamp :  2021.05.25.195904
  ...

This program is able to repack "$ORIG" to gnome disks' idea of a GPT:

  "$HOME"/xorriso_dir/xorriso-1.5.5/xorriso/xorriso \
    -indev "$ORIG" \
    -outdev "$NEW" \
    -changes_pending yes \
    -boot_image any replay \
    -boot_image any mbr_force_bootable=off \
    -boot_image any gpt_iso_bootable=on \
    -boot_image any gpt_iso_not_ro=on

Inspection of "$NEW" by xorriso should yield
  ...
  MBR partition table:   N Status  Type        Start       Blocks
  MBR partition      :   1   0x00  0xee            1      5503775
  GPT                :   N  Info
  ...
  GPT partition flags:   1  0x0000000000000005
  ...

The partition tables of "$NEW" will differ from "$ORIG" by:
- No dummy MBR partition 2, because of mbr_force_bootable=off.
- bit 2 = "Legacy bootable" of the ISO 9660 partition is set, because of
  gpt_iso_bootable=on
- bit 60 = "Read-only" of that partition is not set, because of
  gpt_iso_not_ro=on

(The latter two -boot_image options are new in 1.5.5.)

Have a nice day :)

Thomas

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

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

Status in casper package in Ubuntu:
  Confirmed

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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