[Bug 930447] Re: Unable to start Ubuntu 12.04 live CD with syslinux loader on Pentium M x86 Laptop due to bug in PAE kernel, initramfs or syslinux

[oliver]

I've also made a new USB stick, using grub2 and loopbacking the ISO.

Here is what I did to an empty formatted 2GB USB stick using the LiveDVD
iso (liveCD was same result) and mounted at /mnt.

grub-install --no-floppy --root-directory=/mnt /dev/sdb

grub-mkconfig > /mnt/boot/grub/grub.cfg

Replace all menuentries with the following one.

menuentry "TITLE" {
  iso_path=/ubuntu-12.04-dvd-i386.iso 
  export iso_path
  search --set --file $iso_path
  loopback loop $iso_path
  root=(loop)
  configfile /grub/loopback.cfg
  loopback --delete loop
}

Not sure if i copied loopback.cfg into the grub dir, or if it reads it
directly from the iso, but i belive it does read it directly from the
iso.

Boot.

This boots the iso, as one would expect, except for using syslinux. So
the kernel and initrd from the iso are used, the disk is booted and the
os installed.

So yes, this looks very much like a bug and should be re-opened/fixed.
P.S. I did not try burning the iso to disk, I used the usbcreator and grub only.

So at the moment, I'm quite happy to be running gnome-session-fallback
(hate unity) on stock 12.04 (for now) WITH!! PAE kernel.

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https://bugs.launchpad.net/bugs/930447

Title:
  Unable to start Ubuntu 12.04 live CD with syslinux loader on Pentium M
  x86 Laptop due to bug in PAE kernel, initramfs or syslinux

Status in “linux” package in Ubuntu:
  Won't Fix
Status in “syslinux” package in Ubuntu:
  New
Status in Baltix GNU/Linux:
  Triaged

Bug description:
  Ubuntu 12.04 doesn't start from Desktop CD or USB with syslinux boot
  loader on Pentium M 1.6Ghz or faster Pentium M CPU - displays error
  message about missing PAE feature in CPU, but *the same* *Ubuntu
  12.04* Desktop CD/LiveUSB starts fine on *the same CPU* (and same PAE
  kernel) if GRUB boot loader is used, for example when WUBI or LiveUSB
  with GRUB boot loader, like Multisystem
  (http://liveusb.info/dotclear/index.php?pages/install ) is used!

  The error message is:
  "This kernel requires the following features not present on the CPU: pae.
  Unable to boot - please use a kernel appropriate for you CPU."

  THIS IS AN IMPORTANT REGRESSION! People are able to install and successfully use Ubuntu 12.04 on such pretty new hardware, like IBM Thinkpad T42 laptop with Pentium M 1700Mhz processor, but the bug in syslinux (or something related) forbids Ubuntu 12.04 installation.
  This bug is reproducible on lots of computers, there are several log files and /proc/cpuinfo file attached to this bugreport, AFAIK it's enough to reopen this bug.

  ---
  ApportVersion: 1.23-0ubuntu4
  Architecture: i386
  CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
  MachineType: IBM 2373PPU
  dmi.bios.date: 06/18/2007
  dmi.bios.vendor: IBM
  dmi.bios.version: 1RETDRWW (3.23 )
  dmi.board.name: 2373PPU
  dmi.board.vendor: IBM
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: IBM
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnIBM:bvr1RETDRWW(3.23):bd06/18/2007:svnIBM:pn2373PPU:pvrThinkPadT42:rvnIBM:rn2373PPU:rvrNotAvailable:cvnIBM:ct10:cvrNotAvailable:
  dmi.product.name: 2373PPU
  dmi.product.version: ThinkPad T42
  dmi.sys.vendor: IBM

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