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The easiest way to install a newer kernel is to use Jessie backports.
First you need to add Jessie backports to your repositories, if it's not already there:
echo deb http://http.debian.net/debian jessie-backports main > /etc/apt/sources.list.d/jessie-backports.list
(as root), then
apt-get update apt-get -t jessie-backports install linux-image-amd64