I could change the kernel using cubic?

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In the chroot enviroment, use apt to install linux-image-* packages, to add other available kernels.
You can also manually install kernels from http://kernel.ubuntu.com/~kernel-ppa/mainline/.
These kernels will be included in your customized linux, and will be installed whenever you chose to install Ubuntu using your customized ISO. (Note, the last kernel you install will be setup as default).

Additionally, on the Manage Kernel's Page in Cubic, you can choose which (of your installed kernels) you want to use to boot your live CD. For consistency, select the same as your default kernel from above.

In the chroot enviroment, use apt to install linux-image-* packages, to add other available kernels.
You can also manually install kernels from http://kernel.ubuntu.com/~kernel-ppa/mainline/.
These kernels will be included in your customized linux, and will be installed whenever you chose to install Ubuntu using your customized ISO. (Note, the last kernel you install will be setup as default).

Additionally, on the Manage Kernel's Page in Cubic, you can choose which (of your installed kernels) you want to use to boot your live CD. For consistency, select the same as your default kernel from above.