I was testing the Lubuntu Trusty desktop i386 final iso file and had the
message 'This kernel does not support a non-PAE CPU' when I tried to
install the low latency kernel.

Please make the installer (or some other program part) add forcepae

into /etc/default/grub and from there into /boot/grub/grub.cfg

so that it will be possible to install and upgrade kernels.

The *big* problem will arrive, when new kernel versions arrive, and the
system wants to upgrade to them. And we can expect quite a lot of new
users who come to Lubuntu and Xubuntu after the end of life of Windows
XP. Let us save trouble for these new users by adding forcepae
automatically to the installed system :-)

-o-

Just to confirm my suggested solution, I added forcepae to

/etc/default/grub

and ran

sudo update-grub

After reboot it was possible to install the new kernel (in this somewhat
synthetic case the low-latency kernel), and the computer can run with it
(both kernels work).

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https://bugs.launchpad.net/bugs/1307105

Title:
  Kernel install fails due PAE checks

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