查看当前系统启动用的内核版本

root@zhouss:/boot#uname-rm
4.4.0-92-genericx86_64
root@zhouss:/boot#

列出安装过的内核版本

root@zhouss:/boot#dpkg--get-selections|greplinux-image
linux-image-4.4.0-21-generic			deinstall
linux-image-4.4.0-45-generic			deinstall
linux-image-4.4.0-47-generic			deinstall
linux-image-4.4.0-51-generic			deinstall
linux-image-4.4.0-53-generic			deinstall
linux-image-4.4.0-57-generic			deinstall
linux-image-4.4.0-59-generic			deinstall
linux-image-4.4.0-62-generic			deinstall
linux-image-4.4.0-64-generic			deinstall
linux-image-4.4.0-66-generic			deinstall
linux-image-4.4.0-67-generic			deinstall
linux-image-4.4.0-71-generic			deinstall
linux-image-4.4.0-72-generic			deinstall
linux-image-4.4.0-75-generic			install
linux-image-4.4.0-78-generic			install
linux-image-4.4.0-79-generic			install
linux-image-4.4.0-81-generic			install
linux-image-4.4.0-83-generic			install
linux-image-4.4.0-87-generic			install
linux-image-4.4.0-89-generic			install
linux-image-4.4.0-91-generic			install
linux-image-4.4.0-92-generic			install
linux-image-4.4.0-93-generic			install
linux-image-extra-4.4.0-21-generic		deinstall
linux-image-extra-4.4.0-45-generic		deinstall
linux-image-extra-4.4.0-47-generic		deinstall
linux-image-extra-4.4.0-51-generic		deinstall
linux-image-extra-4.4.0-53-generic		deinstall
linux-image-extra-4.4.0-57-generic		deinstall
linux-image-extra-4.4.0-59-generic		deinstall
linux-image-extra-4.4.0-62-generic		deinstall
linux-image-extra-4.4.0-64-generic		deinstall
linux-image-extra-4.4.0-66-generic		deinstall
linux-image-extra-4.4.0-67-generic		deinstall
linux-image-extra-4.4.0-71-generic		deinstall
linux-image-extra-4.4.0-72-generic		deinstall
linux-image-extra-4.4.0-75-generic		install
linux-image-extra-4.4.0-78-generic		install
linux-image-extra-4.4.0-79-generic		install
linux-image-extra-4.4.0-81-generic		install
linux-image-extra-4.4.0-83-generic		install
linux-image-extra-4.4.0-87-generic		install
linux-image-extra-4.4.0-89-generic		install
linux-image-extra-4.4.0-91-generic		install
linux-image-extra-4.4.0-92-generic		install
linux-image-extra-4.4.0-93-generic		install
linux-image-extra-4.4.0-96-generic		install
root@zhouss:/boot#

把与当前版本不符的全部删除，只保留92版的两个包

root@zhouss:/boot#apt-getautoremovelinux-image-4.4.0-75-generic
root@zhouss:/boot#apt-getautoremovelinux-image-extra-4.4.0-75-generic
类似的，把其他版一一删除

提示：/boot分区没有空间，可能导致无法卸载。

重新平衡：

root@zhouss:/boot#apt-getautoremove-f
root@zhouss:/boot#apt-getinstall-f

重启系统

root@zhouss:/boot#reboot