Ubuntu删除多余内核的方法

rew $ uname -aLinux rew 4.15.0-42-generic #45~16.04.1-Ubuntu SMP Mon Nov 19 13:02:27 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

rew $ dpkg --get-selections | grep linuxconsole-setup-linux           installlibselinux1:amd64            installlibselinux1:i386            installlinux-base               installlinux-firmware             installlinux-generic-hwe-16.04         installlinux-headers-4.15.0-42         installlinux-headers-4.15.0-39         installlinux-headers-4.15.0-39-generic     installlinux-headers-4.15.0-42-generic     installlinux-headers-generic-hwe-16.04     installlinux-image-4.15.0-39-generic      installlinux-image-4.15.0-42-generic      installlinux-image-generic-hwe-16.04      installlinux-libc-dev:amd64          installlinux-libc-dev:i386           installlinux-modules-4.15.0-39-generic     installlinux-modules-4.15.0-42-generic     installlinux-modules-extra-4.15.0-39-generic  installlinux-modules-extra-4.15.0-42-generic  installlinux-sound-base            installpptp-linux               installsyslinux                installsyslinux-common             installsyslinux-legacy             installutil-linux               install

rew $ sudo apt-get remove /linux-headers-4.15.0-39 /linux-headers-4.15.0-39-generic /linux-image-4.15.0-39-generic /linux-modules-4.15.0-39-generic /linux-modules-extra-4.15.0-39-generic

rew $ dpkg --get-selections | grep linuxconsole-setup-linux           installlibselinux1:amd64            installlibselinux1:i386            installlinux-base               installlinux-firmware             installlinux-generic-hwe-16.04         installlinux-headers-4.15.0-42         installlinux-headers-4.15.0-42-generic     installlinux-headers-generic-hwe-16.04     installlinux-image-4.15.0-39-generic      deinstalllinux-image-4.15.0-42-generic      installlinux-image-generic-hwe-16.04      installlinux-libc-dev:amd64          installlinux-libc-dev:i386           installlinux-modules-4.15.0-39-generic     deinstalllinux-modules-4.15.0-42-generic     installlinux-modules-extra-4.15.0-39-generic  deinstalllinux-modules-extra-4.15.0-42-generic  installlinux-sound-base            installpptp-linux               installsyslinux                installsyslinux-common             installsyslinux-legacy             installutil-linux               install

rew $ sudo apt-get purge /linux-headers-4.15.0-39 /linux-headers-4.15.0-39-generic /linux-image-4.15.0-39-generic /linux-modules-4.15.0-39-generic /linux-modules-extra-4.15.0-39-generic

rew $ sudo update-grub #根据情况选择grub/grub2