linux 内核升级

first:
sudo gedit /etc/apt/sources.list
add:
 deb http://ftp.cn.debian.org/debian jessie-backports main
then:
sudo apt-get update

after that:
sudo apt-get -t jessie-backports upgrade

then download linux kernel
https://www.kernel.org    (e.g.  linux-4.4.57.tar.xz)
 
start compile step:
1. su -


2. aptitude install libncurses5-dev   
3. make all -j4
4. make modules_install -j4
5. make install -j4