How to downgrade the Kernel on 11.10

Because of the high power usage I'd like to downgrade my kernel in Ubuntu 11.10 to the version used in 10.10 or 11.04. How can I do that and won't it cause any problems?

How can I do...

You could download the kernel binaries from the old or new Ubuntu releases /1/.

Ubuntu Packages Search: http://packages.ubuntu.com

Picking natty-updates kernel linux-image-2.6.38-10-generic : http://packages.ubuntu.com/natty-updates/linux-image

Downloading it and installing with the command:

sudo dpkg -i linux-image-2.6.38-10-generic_2.6.38-10.46_i386.deb

Package management is telling:

Selecting previously deselected package linux-image-2.6.38-10-generic.
(Reading database ... 127436 files and directories currently installed.)
Unpacking linux-image-2.6.38-10-generic (from linux-image-2.6.38-10-generic_2.6.38-10.46_i386.deb) ...
Done.
Setting up linux-image-2.6.38-10-generic (2.6.38-10.46) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Examining /etc/kernel/postinst.d.

run-parts: executing /etc/kernel/postinst.d/initramfs-tools 2.6.38-10-generic /boot/vmlinuz-2.6.38-10-generic
update-initramfs: Generating /boot/initrd.img-2.6.38-10-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 2.6.38-10-generic /boot/vmlinuz-2.6.38-10-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 2.6.38-10-generic /boot/vmlinuz-2.6.38-10-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 2.6.38-10-generic /boot/vmlinuz-2.6.38-10-generic
Generating grub.cfg ...
Found background image: /lib/plymouth/themes/my-plymouth/my-wallpaper.png
Found linux image: /boot/vmlinuz-3.0.0-12-generic
Found initrd image: /boot/initrd.img-3.0.0-12-generic
Found linux image: /boot/vmlinuz-2.6.38-10-generic

Found initrd image: /boot/initrd.img-2.6.38-10-generic
Found memtest86+ image: /boot/memtest86+.bin
Found Microsoft Windows XP Professional on /dev/sda1
Found Ubuntu 10.10 (10.10) on /dev/sdd1
done

Rebooting

Picking from the grub > Previous Linux versions > Kernel 2.6.38-10

...and the (K)Ubuntu is telling that i'm running with the 2.6.38-10-generic /2/.

...won't it cause any problems?

Well ;) you could tell us...

Links

1. http://www.kubuntuforums.net/showthread.php?51992-FAQ-Kernel


2. http://www.kubuntuforums.net/showthread.php?53976-FAQ-Version-info-Regenerated