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

[Thomas Schmitt]

Hi,

José Marinho wrote:
> I made the experiment you proposed modifying grub.cfg file.
> [...]
> So it seems that you find the cause of the problem. 

By luck and 14 years of xorriso development. :))

Can i talk you into a second test ?
This time only disable the part in grub.cfg which evaluates the variable:

    if [ "$grub_platform" = "efi" ]; then
    menuentry 'Boot from next volume' {
            exit
    }

but leave the command in effect:

    grub_platform

The resulting behavior will be of interest when asking GRUB experts for an
explanation.

-------------------------------------------------------------------------

We still could need to know what wonder exactly gnome disks does for
Lucap.
Somehow the partition table of the ISO influences the ability of
command and/or variable evaluation to do its job in reasonable time.

The proposed xorriso runs will hopefully show what exactly lets
grub_platform or the evaluation of $grub_platform block boot progress.

-------------------------------------------------------------------------

When both open questions are answered, it will be time that Ubuntu ISO
production takes this case to one of the mailing lists about misbehaving
GRUB. Let's have a look into the archives.

Not much replies:
  https://lists.gnu.org/mailman/listinfo/bug-grub

Probably not the right audience:
  https://lists.gnu.org/mailman/listinfo/help-grub

Quite oriented to "[PATCH]"-work. But at least they discuss what is posted:
  https://lists.gnu.org/mailman/listinfo/grub-devel/
I am subscribed to grub-devel, because of grub-mkrescue. So i could serve
as curious bystander who wonders where command grub_platform is
implemented.

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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