PAE

I tried to install Lubuntu into really old machine, Let’s Note CF-W2. Then I got the following message.

This kernel requires the following features not present on the CPU: pae Unable to boot - please use a kernel appropriate for your CPU.

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This kernel requires the following features not present on the CPU:
pae

Unable to boot - please use a kernel appropriate for your CPU.

Let’s Note CF-W2 のスペックは次の通りです。

Environment

Specification

CPU: Intel Pemtium M 32bit 1GHz
RAM: 1GB

OS Image (ISO)

lubuntu-14.04.3-desktop-i386.iso

Reason

The message seems to imply “You are installing 64 bit image into 32 bit machine”, but it’s not correct.

The exact reason is that Intel Pentium M doesn’t support PAE.

PAE

Technology to enable 32 bit CPU to handle memory more than 4 GB. It is implemented not only by Intel, also by AMD.

Solution

私がとった解決策は次の方法です。 Ubuntu の forcepae オプションを使います。

Boot Lubuntu from DVD.
Select language.
Press F6 key and ESC key.
Then you can see the command like the following.

Boot Options file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash --

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Boot Options file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash --
Now select “Install” by up or down key.
Then change the command displayed, like the following. Put “forcepae” into 2 places.

Boot Options file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash forcepae -- forcepae

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Boot Options file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash forcepae -- forcepae
- The first one is an option for kernel booted for installation, and the second one is an option for kernel to be installed.

It worked.

The next site introduce several solutions.

reference: How can I install on a non-PAE CPU?

The Life

Tag Archives: PAE

When I was said, “Unable to boot”