I installed Ubuntu 16 on a server with 500MB /boot partition. After three months now, my zabbix alerted the /boot is used more than 80%.

I'm aftaid that /boot is used 100% and makes the server stop. So I'd like to ask you what I can do now?

I red the Ubuntu official doc why /boot is sometimes needed. My server is not old but the vender haven't released the compatibility with Ubuntu officially yet. I'd like to try remove /boot partition but I'd like to expand the volume first if I/Ubuntu can.

Here is my server disk usages.

$ df -h

Filesystem                Size  Used Avail Use% Mounted on

udev                      7.8G     0  7.8G   0% /dev

tmpfs                     1.6G  9.6M  1.6G   1% /run

/dev/sda5                 380G   29G  332G   8% /

tmpfs                     7.9G  948K  7.9G   1% /dev/shm

tmpfs                     5.0M     0  5.0M   0% /run/lock

tmpfs                     7.9G     0  7.9G   0% /sys/fs/cgroup

/dev/sda1                 453M  341M   85M  81% /boot

Or are there unneccessory files in /boot? I don't know how to decide it.

$ ll /boot

Totla 332M

drwxr-xr-x  4 root root 3.0K 2016-09-13 11:27:02 .

drwxr-xr-x 26 root root 4.0K 2016-09-13 13:20:01 ..

-rw-------  1 root root 3.7M 2016-04-19 07:21:29 System.map-4.4.0-21-generic

-rw-------  1 root root 3.7M 2016-05-13 08:55:58 System.map-4.4.0-22-generic

-rw-------  1 root root 3.7M 2016-06-09 06:39:50 System.map-4.4.0-24-generic

-rw-------  1 root root 3.7M 2016-06-24 21:03:30 System.map-4.4.0-28-generic

-rw-------  1 root root 3.7M 2016-07-13 10:59:43 System.map-4.4.0-31-generic

-rw-------  1 root root 3.7M 2016-07-28 06:28:16 System.map-4.4.0-34-generic

-rw-------  1 root root 3.7M 2016-08-12 04:58:49 System.map-4.4.0-36-generic

-rw-r--r--  1 root root 1.2M 2016-04-19 07:21:29 abi-4.4.0-21-generic

-rw-r--r--  1 root root 1.2M 2016-05-13 08:55:57 abi-4.4.0-22-generic

-rw-r--r--  1 root root 1.2M 2016-06-09 06:39:50 abi-4.4.0-24-generic

-rw-r--r--  1 root root 1.2M 2016-06-24 21:03:30 abi-4.4.0-28-generic

-rw-r--r--  1 root root 1.2M 2016-07-13 10:59:43 abi-4.4.0-31-generic

-rw-r--r--  1 root root 1.2M 2016-07-28 06:28:16 abi-4.4.0-34-generic

-rw-r--r--  1 root root 1.2M 2016-08-12 04:58:49 abi-4.4.0-36-generic

-rw-r--r--  1 root root 185K 2016-04-19 07:21:29 config-4.4.0-21-generic

-rw-r--r--  1 root root 186K 2016-05-13 08:55:57 config-4.4.0-22-generic

-rw-r--r--  1 root root 186K 2016-06-09 06:39:50 config-4.4.0-24-generic

-rw-r--r--  1 root root 186K 2016-06-24 21:03:30 config-4.4.0-28-generic

-rw-r--r--  1 root root 186K 2016-07-13 10:59:43 config-4.4.0-31-generic

-rw-r--r--  1 root root 186K 2016-07-28 06:28:16 config-4.4.0-34-generic

-rw-r--r--  1 root root 186K 2016-08-12 04:58:49 config-4.4.0-36-generic

drwxr-xr-x  5 root root 1.0K 2016-09-13 11:22:51 grub

-rw-r--r--  1 root root  35M 2016-05-14 00:35:50 initrd.img-4.4.0-21-generic

-rw-r--r--  1 root root  35M 2016-05-31 17:08:59 initrd.img-4.4.0-22-generic

-rw-r--r--  1 root root  35M 2016-06-10 15:11:17 initrd.img-4.4.0-24-generic

-rw-r--r--  1 root root  11M 2016-09-13 11:27:05 initrd.img-4.4.0-24-generic.new

-rw-r--r--  1 root root  35M 2016-06-28 07:03:14 initrd.img-4.4.0-28-generic

-rw-r--r--  1 root root  35M 2016-07-15 11:28:54 initrd.img-4.4.0-31-generic

-rw-r--r--  1 root root  35M 2016-08-10 03:18:30 initrd.img-4.4.0-34-generic

-rw-r--r--  1 root root  35M 2016-09-13 11:23:01 initrd.img-4.4.0-36-generic

drwx------  2 root root  12K 2016-05-14 00:03:27 lost+found

-rw-------  1 root root 6.7M 2016-04-19 07:21:29 vmlinuz-4.4.0-21-generic

-rw-------  1 root root 6.7M 2016-05-13 08:55:57 vmlinuz-4.4.0-22-generic

-rw-------  1 root root 6.7M 2016-06-09 06:39:50 vmlinuz-4.4.0-24-generic

-rw-------  1 root root 6.8M 2016-06-24 21:03:30 vmlinuz-4.4.0-28-generic

-rw-------  1 root root 6.8M 2016-07-13 10:59:43 vmlinuz-4.4.0-31-generic

-rw-------  1 root root 6.8M 2016-07-28 06:28:16 vmlinuz-4.4.0-34-generic

-rw-------  1 root root 6.8M 2016-08-12 04:58:49 vmlinuz-4.4.0-36-generic

Does anybody give me an advise?