Two possible workarounds:

* Use a non-PAE kernel - see "How to install Ubuntu 12.10 on non-PAE
CPU" at  http://www.webupd8.org/2012/11/how-to-install-ubuntu-1210-on-
non-pae.html which explains how to modify the iso and links to .deb
packages at http://bazaar.launchpad.net/~webtom/+junk/linux-image-i386
-non-pae/files

* Use the PAE kernel with "fake-pae" - it adds pae to /proc/cpuflags so
the check in the Ubuntu package will pass - see
https://launchpad.net/~prof7bit/+archive/fake-pae and the associated
discussion thread at http://ubuntuforums.org/showthread.php?t=2113826
(this option works surprisingly well - it appears that the PAE kernel
runs fine on Pentium M CPUs, which is surprising because the kernel
config help states "If you say 64GB here, then the kernel will not boot
on CPUs that don't support PAE!")

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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

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