Also related:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/930447 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
Also related:
https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/930447 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