內核是一個系統的靈魂，系統在啟動的時候，就是基於相關的內核啟動該系統的。我們怎么樣更改ubuntu系統的內核並運行它呢？
互聯網安裝內核。
安裝內核的步驟非常簡單，我們可以先查看一下當前的內核版本。
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使用命令：
uname -a
Linux UATinterface 4.4.0-116-generic #140~14.04.1-Ubuntu SMP Fri Feb 16 09:25:20 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
搜索目前存在的內核版本。使用命令：
# apt-cache search linux|grep linux-image
可以看到有很多的內核版本。
linux-image-generic-lts-utopic - Generic Linux kernel image
linux-image-generic-lts-vivid - Generic Linux kernel image
linux-image-generic-lts-wily - Generic Linux kernel image
linux-image-generic-lts-xenial - Generic Linux kernel image
linux-image-hwe-generic-trusty - Depends on the generic hardware enablement kernel image.
linux-image-hwe-virtual-trusty - Depends on the virtual hardware enablement kernel image.
linux-image-lowlatency-lts-utopic - lowlatency Linux kernel image
linux-image-lowlatency-lts-vivid - lowlatency Linux kernel image
linux-image-lowlatency-lts-wily - lowlatency Linux kernel image
linux-image-lowlatency-lts-xenial - lowlatency Linux kernel image
linux-image-unsigned-3.13.0-166-generic - Linux kernel image for version 3.13.0 on 64 bit x86 SMP
linux-image-unsigned-3.13.0-166-lowlatency - Linux kernel image for version 3.13.0 on 64 bit x86 SMP
linux-image-unsigned-3.13.0-167-generic - Linux kernel image for version 3.13.0 on 64 bit x86 SMP
linux-image-unsigned-3.13.0-167-lowlatency - Linux kernel image for version 3.13.0 on 64 bit x86 SMP
linux-image-unsigned-3.13.0-168-generic - Linux kernel image for version 3.13.0 on 64 bit x86 SMP
linux-image-unsigned-3.13.0-168-lowlatency - Linux kernel image for version 3.13.0 on 64 bit x86 SMP
linux-image-unsigned-4.15.0-1023-azure - Linux kernel image for version 4.15.0 on 64 bit x86 SMP
linux-image-unsigned-4.15.0-1030-azure - Linux kernel image for version 4.15.0 on 64 bit x86 SMP
linux-image-unsigned-4.15.0-1031-azure - Linux kernel image for version 4.15.0 on 64 bit x86 SMP
linux-image-unsigned-4.15.0-1032-azure - Linux kernel image for version 4.15.0 on 64 bit x86 SMP
linux-image-unsigned-4.15.0-1035-azure - Linux kernel image for version 4.15.0 on 64 bit x86 SMP
linux-image-unsigned-4.15.0-1036-azure - Linux kernel image for version 4.15.0 on 64 bit x86 SMP
linux-image-unsigned-4.15.0-1037-azure - Linux kernel image for version 4.15.0 on 64 bit x86 SMP
linux-image-unsigned-4.15.0-1039-azure - Linux kernel image for version 4.15.0 on 64 bit x86 SMP
linux-image-unsigned-4.15.0-1040-azure - Linux kernel image for version 4.15.0 on 64 bit x86 SMP
linux-image-unsigned-4.15.0-1041-azure - Linux kernel image for version 4.15.0 on 64 bit x86 SMP
linux-image-unsigned-4.4.0-143-generic - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-unsigned-4.4.0-143-lowlatency - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-unsigned-4.4.0-144-generic - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-unsigned-4.4.0-144-lowlatency - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-virtual-lts-utopic - This package will always depend on the latest minimal generic kernel image.
linux-image-virtual-lts-vivid - This package will always depend on the latest minimal generic kernel image.
linux-image-virtual-lts-wily - This package will always depend on the latest minimal generic kernel image.
linux-image-virtual-lts-xenial - This package will always depend on the latest minimal generic kernel image.
linux-image-4.4.0-1002-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1003-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1005-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1006-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1009-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1010-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1011-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1012-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1014-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1016-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1017-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1019-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1022-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1023-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1024-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1025-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1027-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1028-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1029-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1031-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1032-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1034-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1036-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1037-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1038-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1039-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-1040-aws - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-aws - Linux kernel image for Amazon Web Services (AWS) systems.
安裝的話，需要注意，安裝內核需要安裝image和header，不能只安裝其中一個。
比如我現在安裝一個linux-image-4.8.0-58-generic，就必須還要安裝一個
linux-headers-4.8.0-58-generic。
apt-get install linux-image-4.8.0-58-generic linux-headers-4.8.0-58-generic
安裝完成后，重啟機器。在重啟的過程中，使用TAB+shift組合鍵進入grub引導界面，不同的機器進入的方式可能不同。
這里有的人的是中文，選擇第二個高級選項。選擇我們剛安裝的內核進入，這樣系統運行的內核就是我們新安裝的內核了。