随着系统的升级，无用内核也慢慢累积得越来越多，所以要定时清理，下面是清理的过程。
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| dpkg --get-selections|grep linux
libselinux1:amd64 install
linux-firmware install
linux-generic install
linux-headers-3.5.0-17install
linux-headers-3.5.0-19-generic install
linux-headers-3.5.0-17install
linux-headers-3.5.0-19-generic install
linux-headers-3.5.0-21install
linux-headers-3.5.0-21-generic install
linux-headers-generic install
linux-image-3.5.0-17-generic install
linux-image-3.5.0-19-generic install
linux-image-3.5.0-21-generic install
linux-image-extra-3.5.0-17-generic install
linux-image-extra-3.5.0-19-generic install
linux-image-extra-3.5.0-21-generic install
linux-image-generic install
linux-libc-dev:amd64 install
util-linux install
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需要分别清楚header和image，可以直接用apt-get remove来清除。
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| sudoapt-get remove linux-headers-3.5.0-17sudoapt-get remove linux-headers-3.5.0-17-generic
sudoapt-get remove linux-headers-3.5.0-19sudoapt-get remove linux-headers-3.5.0-19-generic
sudoapt-get remove linux-image-3.5.0-17-generic
sudoapt-get remove linux-image-3.5.0-19-generic
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之后再执行
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| dpkg --get-selections|grep linux
libselinux1:amd64 install
linux-firmware install
linux-generic install
linux-headers-3.5.0-21install
linux-headers-3.5.0-21-generic install
linux-headers-generic install
linux-image-3.5.0-17-generic deinstall
linux-image-3.5.0-19-generic deinstall
linux-image-3.5.0-21-generic install
linux-image-extra-3.5.0-17-generic deinstall
linux-image-extra-3.5.0-19-generic deinstall
linux-image-extra-3.5.0-21-generic install
linux-image-generic install
linux-libc-dev:amd64 install
util-linux install
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清理完毕
