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

[José Marinho]

@ Lucap

I've just test the iso modified keeping grub_platform command and removing the part that evaluates the variable and I get the same results as when I removed both: 32 seconds to togo and 1 minute 22 seconds to language selector.
I wasn't noticed what was changing on partitions layout with all this tweaks but in this last experiment I see with Gnome disks that the usb drive with the modified iso has a MBR partition table instead the GPT partition table of the original ISO. In fact, before all of this experiments on the first post of this report I link a post where give instructions for changing the partition table from GPT to MBR. 
According to fdisk the partition table resulting from the modified ISO is:

Orden (m para obtener ayuda): p
Disco /dev/sdd: 3,79 GiB, 4048551936 bytes, 7907328 sectores
Disk model: Transcend 4GB   
Unidades: sectores de 1 * 512 = 512 bytes
Tamaño de sector (lógico/físico): 512 bytes / 512 bytes
Tamaño de E/S (mínimo/óptimo): 512 bytes / 512 bytes
Tipo de etiqueta de disco: dos
Identificador del disco: 0x00000000

Dispositivo Inicio Comienzo   Final Sectores Tamaño Id Tipo
/dev/sdd1   *            64 5496567  5496504   2,6G 83 Linux
/dev/sdd2           5496568 5506607    10040   4,9M ef EFI (FAT-12/16/32)
/dev/sdd3           5509120 7907327  2398208   1,1G 83 Linux

The last one is a writable partition and was preceding of a empty space of 1.3 MB according with gnome-disks
Furthermore, the first partition is marked as bootable
So I confirm your results.
I'm going to trying the last instructions of Thomas. I don't have too much technical skills either but I'm going to try my luck.

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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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