[Bug 1744357] Re: Bionic 32 bit iso fails to boot

[TJ]

Tested the Xubuntu daily live amd64 ISO (2018-01-19) using QEMU/KVM on
16.04 and couldn't reproduce the boot failure. Selecting "Try..." mode
the system reached the desktop correctly.

sha1sum Downloads/bionic-desktop-amd64.iso 
2faca153b20783ced9eaebc8fe0a288b6807f64f  Downloads/bionic-desktop-amd64.iso

http://cdimage.ubuntu.com/xubuntu/daily-live/current/bionic-desktop-
amd64.iso

Tested using:

# in shell 1
$ nc -l -p 9999 | tee /tmp/bionic-boot.log

# in shell 2
$ qemu-system-x86_64 -enable-kvm -name Xubuntu-18.04-amd64 -monitor stdio -serial tcp:127.0.0.1:9999 -m 2048 -hda /dev/VG_OS/1804 -cdrom /home/tj/Downloads/bionic-desktop-amd64.iso -boot d -usb -k en-gb

# in shell 1
# login with username "xubuntu" password empty

** Attachment added: "Boot log captured via serial port"
   https://bugs.launchpad.net/ubuntu/+source/syslinux/+bug/1744357/+attachment/5039985/+files/bionic-boot.log

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https://bugs.launchpad.net/bugs/1744357

Title:
  Bionic 32 bit iso fails to boot

Status in syslinux package in Ubuntu:
  New

Bug description:
  Noticed a comment in #ubuntu+1 about an issue booting 32 bit Kubuntu
  early UK 19th January, followed up with some testing of various
  flavour 32 bit iso's.

  First checked with 4.13.0-30 (which I installed from bionic-proposed),
  also tested with 4.13.0-25

  Tested all using gnome-disks and dd.

  These tests were all done with ISO's available from the iso tracker
  for Bionic at 06:30 UTC 19th January.

  These flavours fail to boot 32 bit iso with no comment - all I get is
  a reboot of the machine, time to reboot depending on waiting for
  human/kbd or using Try 'flavour' from the boot menu.

  Kubuntu Bionic 32 bit failed to boot using either gnome-disks and dd.
  Lubuntu Bionic 32 bit failed to boot using either gnome-disks and dd.
  Xubuntu Bionic 32 bit failed to boot using either gnome-disks and dd.

  The following 2 flavours were only checked using 4.13.0-30 and iso's
  were downloaded ~16:30 UTC and dd.

  Ubuntu Mate 32 bit failed to boot using dd.
  Ubuntu Budgie 32 bit failed to boot using dd.

  To test that this wasn't an issue locally I also tested Xubuntu
  17.10.1 32 bit ISO - this booted when created on either bionic kernel
  either with gnome-disks or dd.

  In addition I have grub stanza's (see below) set up for ease of
  booting the Xubuntu Bionic ISO's, these are updated at the same time
  as I zsync Xubuntu ISO's.

  Xubuntu 64 bit from GRUB - booted
  Xubuntu 32 bit from GRUB - failed to boot

  menuentry "XUBUNTU 18.04 32B Daily ISO" {
          set isofile="/boot/grubiso/xubuntu-bionic-desktop-i386.iso"
          loopback loop (hd0,6)$isofile
          linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$isofile noprompt noswap noeject
          initrd (loop)/casper/initrd.lz
  }

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