ubuntu删除多余内核
如果升级到了一个新的内核，并且还比较稳定，那么老的内核就可以清理了，放在电脑里也占位置。方法（命令行比较通用）如下：
1.查看系统内存在的内核版本列表：
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| sudo dpkg –get-selections |grep linux
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结果:
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| libselinux1 install
linux-firmware install
linux-generic install
linux-headers-3.2.0-33 install
linux-headers-3.2.0-33-generic install
linux-headers-3.2.0-33-generic-pae install
linux-headers-3.2.0-34 install
linux-headers-3.2.0-34-generic install
linux-headers-3.2.0-34-generic-pae install
linux-headers-3.2.0-35 install
linux-headers-3.2.0-35-generic install
linux-headers-3.2.0-35-generic-pae install
linux-headers-3.2.0-37 install
linux-headers-3.2.0-37-generic install
linux-headers-3.2.0-37-generic-pae install
linux-headers-3.2.0-38 install
linux-headers-3.2.0-38-generic install
linux-headers-3.2.0-38-generic-pae install
linux-headers-3.2.0-40 install
linux-headers-3.2.0-40-generic install
linux-headers-3.2.0-40-generic-pae install
linux-headers-generic install
linux-headers-generic-pae install
linux-image-2.6.32-21-generic deinstall
linux-image-2.6.32-40-generic deinstall
linux-image-2.6.32-41-generic deinstall
linux-image-2.6.32-42-generic install
linux-image-3.2.0-33-generic install
linux-image-3.2.0-34-generic install
linux-image-3.2.0-35-generic install
linux-image-3.2.0-37-generic install
linux-image-3.2.0-38-generic install
linux-image-3.2.0-40-generic install
linux-image-generic install
linux-libc-dev install
linux-sound-base install
pptp-linux install
syslinux install
syslinux-common install
syslinux-legacy install
util-linux install
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2.查看当前Ubuntu系统使用的内核版本
结果：
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| Linux linux 3.2.0-40-generic #64-Ubuntu SMP Mon Mar 25 21:22:26 UTC 2013 i686 i686 i386 GNU/Linux
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3.删除多余内核：
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| sudo apt-get purge
linux-image-2.6.32-21-generic linux-image-2.6.32-40-generic linux-image-2.6.32-41-generic linux-image-2.6.32-42-generic linux-image-3.2.0-33-generic linux-image-3.2.0-34-generic linux-image-3.2.0-35-generic linux-image-3.2.0-37-generic linux-image-3.2.0-38-generic
linux-headers-3.2.0-33 linux-headers-3.2.0-34 linux-headers-3.2.0-35 linux-headers-3.2.0-37 linux-headers-3.2.0-38
|
更新grub：
再次查看一下内核列表，就发现旧版本已经不存在了！
