废弃内核删除
查看当前内核版本：uname -a
Linux linx-c 4.15.0-122-generic #124~16.04.1-Ubuntu SMP Thu Oct 15 16:08:36 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
查看所有内核：
dpkg --get-selections | grep linux
console-setup-linux install
libselinux1:amd64 install
linux-base install
linux-firmware install
linux-generic-hwe-16.04 install
linux-headers-4.15.0-106 install
linux-headers-4.15.0-106-generic install
linux-headers-4.15.0-122 install
linux-headers-4.15.0-122-generic install
linux-headers-generic-hwe-16.04 install
linux-image-4.15.0-101-generic deinstall
linux-image-4.15.0-106-generic install
linux-image-4.15.0-122-generic install
linux-image-4.15.0-29-generic deinstall
linux-image-4.15.0-39-generic deinstall
linux-image-4.15.0-42-generic deinstall
linux-image-4.15.0-43-generic deinstall
linux-image-4.15.0-91-generic deinstall
linux-image-4.15.0-96-generic deinstall
linux-image-4.15.0-99-generic deinstall
linux-image-generic-hwe-16.04 install
linux-libc-dev:amd64 install
linux-modules-4.15.0-101-generic deinstall
linux-modules-4.15.0-106-generic install
linux-modules-4.15.0-122-generic install
linux-modules-4.15.0-29-generic deinstall
linux-modules-4.15.0-39-generic deinstall
linux-modules-4.15.0-42-generic deinstall
linux-modules-4.15.0-43-generic deinstall
linux-modules-4.15.0-91-generic deinstall
linux-modules-4.15.0-96-generic deinstall
linux-modules-4.15.0-99-generic deinstall
linux-modules-extra-4.15.0-101-generic deinstall
linux-modules-extra-4.15.0-106-generic install
linux-modules-extra-4.15.0-122-generic install
linux-modules-extra-4.15.0-29-generic deinstall
linux-modules-extra-4.15.0-39-generic deinstall
linux-modules-extra-4.15.0-42-generic deinstall
linux-modules-extra-4.15.0-43-generic deinstall
linux-modules-extra-4.15.0-91-generic deinstall
linux-modules-extra-4.15.0-96-generic deinstall
linux-modules-extra-4.15.0-99-generic deinstall
linux-sound-base install
pptp-linux install
syslinux install
syslinux-common install
syslinux-legacy install
util-linux install
删除4.15.0-122以外的所有项：
sudo apt-get purge 删除项
e.g:
sudo apt-get purge linux-modules-extra-4.15.0-99-generic
删除之后：
console-setup-linux install
libselinux1:amd64 install
linux-base install
linux-firmware install
linux-generic-hwe-16.04 install
linux-headers-4.15.0-122 install
linux-headers-4.15.0-122-generic install
linux-headers-generic-hwe-16.04 install
linux-image-4.15.0-122-generic install
linux-image-generic-hwe-16.04 install
linux-libc-dev:amd64 install
linux-modules-4.15.0-122-generic install
linux-modules-extra-4.15.0-122-generic install
linux-sound-base install
pptp-linux install
syslinux install
syslinux-common install
syslinux-legacy install
util-linux install
软件安装包清理
sudo apt-get autoclean //删除你已经卸载掉的软件包
sudo apt-get clean //把电脑上存储的安装包全部卸载