Now it is time for me to say thank you :-)

First of all, *I want to thank everybody contributing* to solving this
bug, or complex of bugs, concerning Pentium M and Celeron M CPUs and new
Ubuntu based kernels.

Then I want to mention roland aus köln (devzero-c), who continued
pushing this issue when we had given up (either completely or like me,
resorting to work-arounds).

And I want to thank Chris Bainbridge, who was able to do the actual bug-
fixes that made the ship turn around. I don't know if you are a
developer or a very skilled user, but you made a great difference.

Finally I want to thank you Chris for sharing the link to instructions,
that actually got me over the threshold to build a custom syslinux
bootable system. I'm working right now on a debian system, that should
be able to install from a CD/DVD or USB drive to very different systems
(including very old and limited systems) by flashing compressed image
files (img.xz files) or iso files and growing the file system when there
is extra space available.

I show the link again for everybody else, who might be interested. It
works for me with a couple of minor tweaks, the main one that I needed
to import a gpg key separately.

Best regards
sudodus alias Nio

----- Comment #279 -----
Chris Bainbridge (chris-bainbridge) wrote on 2014-03-03:        #279

lkml: "grub is jumping to the 32-bit entry point and skipping the entire
real mode setup code. Bad grub."

You don't need to build a syslinux bootable iso. You can boot the kernel
from Grub in 16-bit mode by using the linux16 command and

According to the discussion on LKML, linux16 is now the default on
Fedora, and should be used by other distributions.

(If you still want to build a custom syslinux bootable system, just for fun, 
see the instructions at - it's about 
25 lines of code in total, and not difficult to follow)

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  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:
  Fix Released
Status in “syslinux” package in Ubuntu:
Status in Baltix GNU/Linux:

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
  ( ) 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 
  MachineType: IBM 2373PPU 06/18/2007
  dmi.bios.vendor: IBM
  dmi.bios.version: 1RETDRWW (3.23 ) 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:bvnIBM:bvr1RETDRWW(3.23):bd06/18/2007:svnIBM:pn2373PPU:pvrThinkPadT42:rvnIBM:rn2373PPU:rvrNotAvailable:cvnIBM:ct10:cvrNotAvailable: 2373PPU
  dmi.product.version: ThinkPad T42
  dmi.sys.vendor: IBM

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