Cannot Install Kali KeX under Windows 10 WSL

I'm struggling with getting Kali running under WSL in Windows 10. This is a completely fresh install; the kernel is up and running but I can't get the KeX graphical user interface to install. The problem is a component of ettercap call ettercap-common. Here's what I get from apt-get:

The following additional packages will be installed:
ettercap-common
The following NEW packages will be installed:
ettercap-common
0 upgraded, 1 newly installed, 0 to remove and 106 not upgraded.
926 not fully installed or removed.
Need to get 0 B/735 kB of archives.
After this operation, 2578 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
E: Invalid archive signature
E: Internal error, could not locate member control.tar.{zstlz4gzxzbz2lzma}
E: Prior errors apply to /var/cache/apt/archives/ettercap-common_1%3a0.8.3.1-3_amd64.deb
debconf: apt-extracttemplates failed: No such file or directory
dpkg-deb: error: '/var/cache/apt/archives/ettercap-common_1%3a0.8.3.1-3_amd64.deb' is not a Debian format archive
dpkg: error processing archive /var/cache/apt/archives/ettercap-common_1%3a0.8.3.1-3_amd64.deb (--unpack):
dpkg-deb --control subprocess returned error exit status 2
Errors were encountered while processing:
/var/cache/apt/archives/ettercap-common_1%3a0.8.3.1-3_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

I've tried to clean up the package database 40 different ways; most of them stop with "too many error messages".

It looks to be like the repository archive is corrupt, but I'm hardly an expert.

What can I do to get past all this?