系统用得久了，积累下来很多升级后留下的旧版本内核，今天升级的时候自动更新了OPENJDK11后发现报出磁盘空间不足了，于是开始删除各种文件，删除了从OPENJDK8开始的所有JAVA包之后自然想到了旧的内核文件，一查果然占用空间也不小：
┌─[root@xxx]─[/boot]
└──╼ #ll -h
total 587M
-rw-r--r-- 1 root root 200K Oct 7 03:04 config-4.18.0-parrot10-amd64
-rw-r--r-- 1 root root 200K Sep 7 23:04 config-4.18.0-parrot8-amd64
drwx------ 7 root root 4.0K Jan 1 1970 efi
drwxr-xr-x 5 root root 4.0K Oct 11 09:10 grub
-rw-r--r-- 1 root root 29M Oct 12 2017 initrd.img-4.11.0-parrot6-amd64.old-dkms
-rw-r--r-- 1 root root 30M Nov 16 2017 initrd.img-4.12.0-parrot6-amd64.old-dkms
-rw-r--r-- 1 root root 30M Dec 15 2017 initrd.img-4.13.0-parrot10-amd64.old-dkms
-rw-r--r-- 1 root root 30M Jan 2 2018 initrd.img-4.13.0-parrot13-amd64.old-dkms
-rw-r--r-- 1 root root 30M Dec 4 2017 initrd.img-4.13.0-parrot4-amd64.old-dkms
-rw-r--r-- 1 root root 34M Feb 26 2018 initrd.img-4.14.0-parrot12-amd64.old-dkms
-rw-r--r-- 1 root root 36M May 4 09:18 initrd.img-4.14.0-parrot13-amd64.old-dkms
-rw-r--r-- 1 root root 33M Jan 15 2018 initrd.img-4.14.0-parrot2-amd64.old-dkms
-rw-r--r-- 1 root root 33M Jan 23 2018 initrd.img-4.14.0-parrot7-amd64.old-dkms
-rw-r--r-- 1 root root 36M May 14 09:19 initrd.img-4.15.0-parrot11-amd64.old-dkms
-rw-r--r-- 1 root root 36M Jun 2 10:39 initrd.img-4.15.0-parrot17-amd64.old-dkms
-rw-r--r-- 1 root root 54M Aug 20 09:07 initrd.img-4.16.0-parrot12-amd64.old-dkms
-rw-r--r-- 1 root root 54M Jul 22 13:57 initrd.img-4.16.0-parrot5-amd64.old-dkms
-rw-r--r-- 1 root root 56M Oct 31 13:29 initrd.img-4.18.0-parrot10-amd64
-rw-r--r-- 1 root root 56M Oct 11 08:57 initrd.img-4.18.0-parrot8-amd64
-rw-r--r-- 1 root root 3.2M Oct 7 03:04 System.map-4.18.0-parrot10-amd64
-rw-r--r-- 1 root root 3.2M Sep 7 23:04 System.map-4.18.0-parrot8-amd64
-rw-r--r-- 1 root root 4.9M Oct 7 03:04 vmlinuz-4.18.0-parrot10-amd64
-rw-r--r-- 1 root root 4.9M Sep 7 23:04 vmlinuz-4.18.0-parrot8-amd64
找大佬分享的经验，参考到如下查询命令：dpkg --get-selections | grep linux
┌─[root@xxx]─[/boot]
└──╼ #dpkg --get-selections | grep linux
binutils-x86-64-linux-gnu install
console-setup-linux install
enum4linux install
firmware-linux install
firmware-linux-free install
firmware-linux-nonfree install
fonts-linuxlibertine install
libnvpair1linux install
libselinux1:amd64 install
libuutil1linux install
libzfs2linux install
libzpool2linux install
linux-base install
linux-compiler-gcc-7-x86 install
linux-exploit-suggester install
linux-headers-4.18.0-parrot10-amd64 install
linux-headers-4.18.0-parrot10-common install
linux-headers-4.18.0-parrot8-amd64 install
linux-headers-4.18.0-parrot8-common install
linux-headers-amd64 install
linux-image-4.11.0-parrot6-amd64 deinstall
linux-image-4.12.0-parrot6-amd64 deinstall
linux-image-4.13.0-parrot10-amd64 deinstall
linux-image-4.13.0-parrot13-amd64 deinstall
linux-image-4.13.0-parrot4-amd64 deinstall
linux-image-4.14.0-parrot12-amd64 deinstall
linux-image-4.14.0-parrot13-amd64 deinstall
linux-image-4.14.0-parrot2-amd64 deinstall
linux-image-4.14.0-parrot7-amd64 deinstall
linux-image-4.15.0-parrot11-amd64 deinstall
linux-image-4.15.0-parrot17-amd64 deinstall
linux-image-4.16.0-parrot12-amd64 deinstall
linux-image-4.16.0-parrot16-amd64 deinstall
linux-image-4.16.0-parrot5-amd64 deinstall
linux-image-4.17.0-parrot17-amd64 deinstall
linux-image-4.17.0-parrot8-amd64 deinstall
linux-image-4.18.0-parrot10-amd64 install
linux-image-4.18.0-parrot8-amd64 install
linux-image-amd64 install
linux-kbuild-4.18 install
linux-libc-dev:amd64 install
python-selinux install
python3-selinux install
selinux-policy-default deinstall
selinux-policy-dev deinstall
selinux-utils install
util-linux install
zfsutils-linux install
找到了就大刀向内核文件砍去吧 ：
┌─[root@xxx]─[/boot]
└──╼ #apt remove --purge linux-image-4.12.0-parrot6-amd64 linux-image-4.13.0-parrot10-amd64 linux-image-4.13.0-parrot13-amd64 linux-image-4.13.0-parrot4-amd64 linux-image-4.14.0-parrot12-amd64 linux-image-4.14.0-parrot13-amd64 linux-image-4.14.0-parrot2-amd64 linux-image-4.14.0-parrot7-amd64 linux-image-4.15.0-parrot11-amd64 linux-image-4.15.0-parrot17-amd64 linux-image-4.16.0-parrot12-amd64 linux-image-4.16.0-parrot16-amd64 linux-image-4.16.0-parrot5-amd64 linux-image-4.17.0-parrot17-amd64 linux-image-4.17.0-parrot8-amd64
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
gvfs-bin icedtea-netx-common java-wrappers libadns1 python-adns python-easygui python-metaconfig
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
linux-image-4.12.0-parrot6-amd64* linux-image-4.13.0-parrot10-amd64* linux-image-4.13.0-parrot13-amd64*
linux-image-4.13.0-parrot4-amd64* linux-image-4.14.0-parrot12-amd64* linux-image-4.14.0-parrot13-amd64*
linux-image-4.14.0-parrot2-amd64* linux-image-4.14.0-parrot7-amd64* linux-image-4.15.0-parrot11-amd64*
linux-image-4.15.0-parrot17-amd64* linux-image-4.16.0-parrot12-amd64* linux-image-4.16.0-parrot16-amd64*
linux-image-4.16.0-parrot5-amd64* linux-image-4.17.0-parrot17-amd64* linux-image-4.17.0-parrot8-amd64*
0 upgraded, 0 newly installed, 15 to remove and 0 not upgraded.
3 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] Y
(Reading database ... 524662 files and directories currently installed.)
Purging configuration files for linux-image-4.14.0-parrot13-amd64 (4.14.13-1parrot13) ...
Purging configuration files for linux-image-4.15.0-parrot17-amd64 (4.15.17-1parrot17) ...
Purging configuration files for linux-image-4.16.0-parrot5-amd64 (4.16.5-1parrot5) ...
Purging configuration files for linux-image-4.12.0-parrot6-amd64 (4.12.6-1parrot6) ...
Purging configuration files for linux-image-4.13.0-parrot13-amd64 (4.13.13-1parrot13) ...
Purging configuration files for linux-image-4.13.0-parrot4-amd64 (4.13.4-2parrot0) ...
Purging configuration files for linux-image-4.17.0-parrot8-amd64 (4.17.8-1parrot8) ...
rmdir: failed to remove '/lib/modules/4.17.0-parrot8-amd64': Directory not empty
dpkg: warning: while removing linux-image-4.17.0-parrot8-amd64, directory '/lib/modules/4.17.0-parrot8-amd64' not empty so not removed
Purging configuration files for linux-image-4.13.0-parrot10-amd64 (4.13.10-1parrot10) ...
Purging configuration files for linux-image-4.16.0-parrot12-amd64 (4.16.12-1parrot12.1) ...
Purging configuration files for linux-image-4.14.0-parrot12-amd64 (4.14.12-2parrot12) ...
Purging configuration files for linux-image-4.15.0-parrot11-amd64 (4.15.11-1parrot11) ...
Purging configuration files for linux-image-4.17.0-parrot17-amd64 (4.17.17-1parrot17) ...
rmdir: failed to remove '/lib/modules/4.17.0-parrot17-amd64': Directory not empty
dpkg: warning: while removing linux-image-4.17.0-parrot17-amd64, directory '/lib/modules/4.17.0-parrot17-amd64' not empty so not removed
Purging configuration files for linux-image-4.16.0-parrot16-amd64 (4.16.16-2parrot16) ...
Purging configuration files for linux-image-4.14.0-parrot7-amd64 (4.14.7-1parrot7) ...
Purging configuration files for linux-image-4.14.0-parrot2-amd64 (4.14.2-1parrot2) ...
Configuring sandbox profiles....
Sandbox profiles updated!
最后并未自动删除old-dkms文件，手动删除了且不要忘记嘱咐sudo update-grub更新开机启动控制文件。