3.2.52-030252-generic-pae 的 Linux 头文件

Question

我正在使用 ubuntu 14.04，想要安装标头。我运行了

sudo apt-get install linux-headers-$(uname -r)

但我明白

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package linux-headers-3.2.52-030252-generic-pae
E: Couldn't find any package by regex 'linux-headers-3.2.52-030252-generic-pae'

这个特定内核版本的标头位于哪里？