очистить boot

/home/admin# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 19G 7.8G 9.8G 45% /
devtmpfs 239M 0 239M 0% /dev
tmpfs 241M 0 241M 0% /dev/shm
tmpfs 241M 25M 216M 11% /run
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 241M 0 241M 0% /sys/fs/cgroup
/dev/xvda1 190M 173M 3.3M 99% /boot
tmpfs 49M 0 49M 0% /run/user/1000

/home/admin# ls -lah /boot
total 165M
drwxr-xr-x 4 root root 3.0K Oct 19 07:17 .
drwxr-xr-x 24 root root 4.0K Oct 18 12:28 ..
-rw-r--r-- 1 root root 187K Nov 14 2019 config-4.4.0-170-generic
-rw-r--r-- 1 root root 187K Aug 29 04:20 config-4.4.0-190-generic
-rw-r--r-- 1 root root 187K Oct 6 22:51 config-4.4.0-193-generic
drwxr-xr-x 5 root root 1.0K Oct 19 07:23 grub
-rw-r--r-- 1 root root 11M Oct 19 07:11 initrd.img-4.4.0-112-generic
-rw-r--r-- 1 root root 11M Oct 19 07:11 initrd.img-4.4.0-116-generic
-rw-r--r-- 1 root root 11M Oct 19 07:11 initrd.img-4.4.0-119-generic
-rw-r--r-- 1 root root 11M Oct 19 07:11 initrd.img-4.4.0-121-generic
-rw-r--r-- 1 root root 40M Oct 19 07:11 initrd.img-4.4.0-170-generic
-rw-r--r-- 1 root root 40M Oct 19 07:11 initrd.img-4.4.0-190-generic
-rw-r--r-- 1 root root 11M Oct 19 07:11 initrd.img-4.4.0-97-generic
drwx------ 2 root root 12K Jul 2 2016 lost+found
-rw------- 1 root root 3.8M Nov 14 2019 System.map-4.4.0-170-generic
-rw------- 1 root root 3.8M Aug 29 04:20 System.map-4.4.0-190-generic
-rw------- 1 root root 3.8M Oct 6 22:51 System.map-4.4.0-193-generic
-rw------- 1 root root 6.9M Nov 14 2019 vmlinuz-4.4.0-170-generic
-rw------- 1 root root 6.9M Aug 31 18:18 vmlinuz-4.4.0-190-generic
-rw------- 1 root root 6.9M Oct 14 00:48 vmlinuz-4.4.0-193-generic

/home/admin# dpkg --list | grep linux-image
ii linux-image-4.4.0-170-generic 4.4.0-170.199 amd64 Signed kernel image generic
ii linux-image-4.4.0-190-generic 4.4.0-190.220 amd64 Signed kernel image generic
iF linux-image-4.4.0-193-generic 4.4.0-193.224 amd64 Signed kernel image generic
ii linux-image-generic 4.4.0.193.199 amd64 Generic Linux kernel image

uname -r
4.4.0-170-generic

забит boot,autoremove не работает
насколько безопасно удалить несколько файлов initrd.img чтобы освободить место? после перезагрузки машина стартанет?