>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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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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