Install squeeze backports kernel

$ sudo apt-get -t squeeze-backports install linux-image-amd64
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  linux-image-3.1.0-0.bpo.1-amd64
Suggested packages:
  linux-doc-3.1
The following NEW packages will be installed:
  linux-image-3.1.0-0.bpo.1-amd64
The following packages will be upgraded:
  linux-image-amd64
1 upgraded, 1 newly installed, 0 to remove and 42 not upgraded.
Need to get 0 B/32.5 MB of archives.
After this operation, 115 MB of additional disk space will be used.
Do you want to continue [Y/n]?
Reading changelogs... Done
Preconfiguring packages ...
Selecting previously deselected package linux-image-3.1.0-0.bpo.1-amd64.
(Reading database ... 54594 files and directories currently installed.)
Unpacking linux-image-3.1.0-0.bpo.1-amd64 (from .../linux-image-3.1.0-0.bpo.1-amd64_3.1.8-2~bpo60+1_amd64.deb) ...
Preparing to replace linux-image-amd64 2.6.32+29 (using .../linux-image-amd64_3.1+41~bpo60+1_amd64.deb) ...
Unpacking replacement linux-image-amd64 ...
Setting up linux-image-3.1.0-0.bpo.1-amd64 (3.1.8-2~bpo60+1) ...
Running depmod.
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.1.0-0.bpo.1-amd64 /boot/vmlinuz-3.1.0-0.bpo.1-amd64
update-initramfs: Generating /boot/initrd.img-3.1.0-0.bpo.1-amd64
run-parts: executing /etc/kernel/postinst.d/pm-utils 3.1.0-0.bpo.1-amd64 /boot/vmlinuz-3.1.0-0.bpo.1-amd64
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.1.0-0.bpo.1-amd64 /boot/vmlinuz-3.1.0-0.bpo.1-amd64
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.1.0-0.bpo.1-amd64
Found initrd image: /boot/initrd.img-3.1.0-0.bpo.1-amd64
Found linux image: /boot/vmlinuz-2.6.32-5-amd64
Found initrd image: /boot/initrd.img-2.6.32-5-amd64
done
Setting up linux-image-amd64 (3.1+41~bpo60+1) ...