Problem to install 2.7 in Ubuntu 12.04

I try to install Lunux CNC in a new Ubuntu 12.04 (32 Bit) system and use the manual: Getting Stated V2.7.0 (page 8)
www.linuxcnc.org/docs/2.7/pdf/LinuxCNC_Getting_Started.pdf

But if I reboot the system (point 8) and type "uname -r" in the Terminal the system print "3.13.0-65-generic" and not "3.4-9-rtai-686-pae"

Where or how I can change the setting?

The instructions are wrong (or incomplete to be exact).

When you install a new kernel, you have to run

sudo update-grub

or the kernel will never be presented in the boot menu, for you to select.

Do that and then reboot and the rtai kernel should be a boot option

regards

Thank you,

But I had made ​​a second mistake.
after that the grub has to be edited.

the line:
GRUB_HIDDEN_TIMEOUT=0
has to be delete or edit to:
#GRUB_HIDDEN_TIMEOUT=0

Otherwise, the boot menu does not appear.

You can just hold down [Esc] during the boot, so long as your keyboard is recognised at boot.

The GRUB_HIDDEN and similar are a pain.
Jessie seems to be hiding all kernels / partitions other than the default booting one as a matter of course now, although you can select a menu item that will show you them if you are quick.