I'm trying to install linux-libc-dev with apt-get in Windows Subsystem for Linux (ubuntu), but I get an error and I can't seem to resolve it:

```
dpkg: error processing archive /var/cache/apt/archives/linux-libc-dev_3.13.0-126.175_amd64.deb (--unpack):
 unable to install new version of `/usr/include/linux/netfilter/xt_DSCP.h': File exists
Errors were encountered while processing:
 /var/cache/apt/archives/linux-libc-dev_3.13.0-126.175_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

```

But when I list the files in /usr/include/, the linux directory doesn't even exist.

What could be causing this? How can the file exist when the directory does not?

Thanks.