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我的/boot分区快满了，每次重新启动系统时都会收到警告。我已经删除了旧的内核包（linux-headers ...），实际上我这样做是为了安装自动更新附带的较新内核版本。

安装新版本后，分区又快满了。那我还能删除什么？是否有其他一些与旧内核映像相关的文件？

这是我的/boot分区上的文件列表：

:~$ ls /boot/
abi-2.6.31-21-generic         lost+found
abi-2.6.32-25-generic         memtest86+.bin
abi-2.6.38-10-generic         memtest86+_multiboot.bin
abi-2.6.38-11-generic         System.map-2.6.31-21-generic
abi-2.6.38-12-generic         System.map-2.6.32-25-generic
abi-2.6.38-8-generic          System.map-2.6.38-10-generic
abi-3.0.0-12-generic          System.map-2.6.38-11-generic
abi-3.0.0-13-generic          System.map-2.6.38-12-generic
abi-3.0.0-14-generic          System.map-2.6.38-8-generic
boot                          System.map-3.0.0-12-generic
config-2.6.31-21-generic      System.map-3.0.0-13-generic
config-2.6.32-25-generic      System.map-3.0.0-14-generic
config-2.6.38-10-generic      vmcoreinfo-2.6.31-21-generic
config-2.6.38-11-generic      vmcoreinfo-2.6.32-25-generic
config-2.6.38-12-generic      vmcoreinfo-2.6.38-10-generic
config-2.6.38-8-generic       vmcoreinfo-2.6.38-11-generic
config-3.0.0-12-generic       vmcoreinfo-2.6.38-12-generic
config-3.0.0-13-generic       vmcoreinfo-2.6.38-8-generic
config-3.0.0-14-generic       vmcoreinfo-3.0.0-12-generic
extlinux                      vmcoreinfo-3.0.0-13-generic
grub                          vmcoreinfo-3.0.0-14-generic
initrd.img-2.6.31-21-generic  vmlinuz-2.6.31-21-generic
initrd.img-2.6.32-25-generic  vmlinuz-2.6.32-25-generic
initrd.img-2.6.38-10-generic  vmlinuz-2.6.38-10-generic
initrd.img-2.6.38-11-generic  vmlinuz-2.6.38-11-generic
initrd.img-2.6.38-12-generic  vmlinuz-2.6.38-12-generic
initrd.img-2.6.38-8-generic   vmlinuz-2.6.38-8-generic
initrd.img-3.0.0-12-generic   vmlinuz-3.0.0-12-generic
initrd.img-3.0.0-13-generic   vmlinuz-3.0.0-13-generic
initrd.img-3.0.0-14-generic   vmlinuz-3.0.0-14-generic

目前，我正在使用3.0.0-14-generic内核。

当我尝试进行每日更新时，软件更新程序出现错误。它说：

The upgrade needs a total of 25.3 M free space on disk `/boot`.
Please free at least an additional 25.3 M of disk space on `/boot`.
Empty your trash and remove temporary packages of former installations 
using `sudo apt-get clean`.

我尝试在sudo apt-get clean终端中输入，但我仍然收到消息。我阅读的所有页面似乎都是为有经验的 Ubuntu 用户准备的。我正在运行 Ubuntu 12.10。我想升级到 13.04，但我知道我必须先完成这些。

这是cat /etc/fstab在终端中输入的输出：

# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with …