安装方法：
sudo apt install linux-image-4.8.0-1-rt-amd64 linux-headers-4.8.0-1-rt-amd64
安装完成后重启就可以进入4.8内核。
目前我还不知道Debian上游在4.8里面加入了什么新东西。
附：Linux4.8内核信息：
1.markson@Acer-Aspire:~$ sudo aptitude show linux-image-4.8.0-1-rt-amd64
软件包：linux-image-4.8.0-1-rt-amd64
版本号：4.8.5-1
新: 是
状态: 已安装
自动安装: 否
优先级：可选
部分：kernel
维护者：Debian Kernel Team <debian-kernel@lists.debian.org>
体系：amd64
未压缩尺寸：184 M
依赖于: kmod, linux-base (>= 4.3~), initramfs-tools (>= 0.110~) | linux-initramfs-tool
推荐: firmware-linux-free, irqbalance
建议: linux-doc-4.8, debian-kernel-handbook, grub-pc | grub-efi-amd64 | extlinux
冲突: linux-image-4.8.0-1-rt-amd64-unsigned
破坏: initramfs-tools (< 0.110~), xserver-xorg-input-vmmouse (< 1:13.0.99), initramfs-tools:i386 (< 0.110~),
xserver-xorg-input-vmmouse:i386 (< 1:13.0.99)
代替: linux-image-4.8.0-1-rt-amd64-unsigned
提供者：: linux-image-4.8.0-1-rt-amd64-unsigned (4.8.5-1)
描述：Linux 4.8 for 64-bit PCs, PREEMPT_RT (signed)
The Linux kernel 4.8 and modules for use on PCs with AMD64, Intel 64 or VIA Nano processors.
This kernel includes the PREEMPT_RT realtime patch set.
The kernel image and modules are signed for use with Secure Boot.
主页：https://www.kernel.org/
2.markson@Acer-Aspire:~$ sudo aptitude show linux-headers-4.8.0-1-rt-amd64
软件包：linux-headers-4.8.0-1-rt-amd64
版本号：4.8.5-1
新: 是
状态: 已安装
自动安装: 否
优先级：可选
部分：kernel
维护者：Debian Kernel Team <debian-kernel@lists.debian.org>
体系：amd64
未压缩尺寸：4,183 k
依赖于: linux-headers-4.8.0-1-common-rt (= 4.8.5-1), linux-kbuild-4.8, linux-compiler-gcc-5-x86
描述：Header files for Linux 4.8.0-1-rt-amd64
This package provides the architecture-specific kernel header files for Linux kernel 4.8.0-1-rt-amd64, generally used for
building out-of-tree kernel modules. These files are going to be installed into /usr/src/linux-headers-4.8.0-1-rt-amd64, and
can be used for building modules that load into the kernel provided by the linux-image-4.8.0-1-rt-amd64 package.
主页：https://www.kernel.org/