[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

[Christiansen]

>From what I understand Oliver is saying in #97, the problem is not that
a non-pae kernel should be supportet, but that the LiveCD does prevent
installation on boxes that run the -pae kerne just fine.

I've successfully installed and used the -pae enabled kernel on a ThinkPad R51, on which I receive the the error message about the the CPU not supporting PAE when running the LiveCD.
A clean installation was first carried out using the the non-pae mini.iso (http://archive.ubuntu.com/ubuntu/dists/precise/main/installer-i386/current/images/netboot/non-pae/mini.iso) to perform a network installation. After the installation and a full online-update was done, the PAE enabled kernel (linux-image-3.2.0-24-generic-pae_3.2.0-24.39_i386) was installed. A reboot and a the non-PAE kernel (	linux-image-3.2.0-24-generic_3.2.0-24.39_i386) was removed.

I've tried (like #96 suggested) to exchange the kernel and initrd in
/casper on the LiveCD from USB (by startup-disk creator), with the
working -pae kernel from harddisk. It bootet from the USB, but the error
message about missing PAE capability was still thrown, why I believe it
must be somthing in the squashfs image then.

So the conclusion must be, like that of  that the #91, that there is a
bug in the LiveCD image, that prevent it from running the PAE enabled
kernel even on some PAE capable hardware.

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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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