查看内核版本
$ sudo uname -r
3.19.0-25-generic
安装3.19.0-47-generic 等3个内核相关的软件包:
$ sudo apt-get install -y linux-image-3.19.0-47-generic linux-image-extra-3.19.0-47-generic linuxheaders-3.19.0-47-generic
卸载3.19.0-25版本的内核相关的软件包:
apt-get purge -y linux-image-3.19.0-25 linux-image-extra-3.19.0-25-generic
apt-get purge -y linux-headers-3.19.0-25 linux-headers-3.19.0-25-generic