boot partition contains boot loader files, kernels, modules, init ram disks and some additional components. Probably you have few versions of kernels + adds and it consumes you space within /boot partition. For example:
root@server# ls -1 /boot
abi-3.11.0-15-generic
abi-3.11.0-17-generic
abi-3.11.0-20-generic
abi-3.11.0-23-generic
abi-3.11.0-24-generic
abi-3.8.0-29-generic
abi-3.8.0-35-generic
abi-3.8.0-36-generic
abi-3.8.0-39-generic
abi-3.8.0-42-generic
config-3.11.0-15-generic
config-3.11.0-17-generic
config-3.11.0-20-generic
config-3.11.0-23-generic
config-3.11.0-24-generic
config-3.8.0-29-generic
config-3.8.0-35-generic
config-3.8.0-36-generic
config-3.8.0-39-generic
config-3.8.0-42-generic
grub
initrd.img-3.11.0-15-generic
initrd.img-3.11.0-17-generic
initrd.img-3.11.0-20-generic
initrd.img-3.11.0-23-generic
initrd.img-3.11.0-24-generic
initrd.img-3.8.0-29-generic
initrd.img-3.8.0-35-generic
initrd.img-3.8.0-36-generic
initrd.img-3.8.0-39-generic
initrd.img-3.8.0-42-generic
System.map-3.11.0-15-generic
System.map-3.11.0-17-generic
System.map-3.11.0-20-generic
System.map-3.11.0-23-generic
System.map-3.11.0-24-generic
System.map-3.8.0-29-generic
System.map-3.8.0-35-generic
System.map-3.8.0-36-generic
System.map-3.8.0-39-generic
System.map-3.8.0-42-generic
vmlinuz-3.11.0-15-generic
vmlinuz-3.11.0-17-generic
vmlinuz-3.11.0-20-generic
vmlinuz-3.11.0-23-generic
vmlinuz-3.11.0-24-generic
vmlinuz-3.8.0-29-generic
vmlinuz-3.8.0-35-generic
vmlinuz-3.8.0-36-generic
vmlinuz-3.8.0-39-generic
vmlinuz-3.8.0-42-generic
Check which version of the kernel(s) you are really using now and remove unnecessary ones.
BE CAREFUL! ;-)
apt
cache located in/var/apt/cache
. Nothing to do with/boot
– Cornelius Apr 24 '14 at 10:30