Comment 2 for bug 2107223

That 3142 sure reminds me of apt-cacher-ng. I've seen this behavior from it before. (I'm aware some people swear by it but I've seen it myself and others have reported size and hash mismatches. I switched to squid-deb-proxy.)

If you've got apt-cacher-ng in your environment, try working around it for a while and see how it goes. I believe I had to clear *both* apt-cacher-ng and apt's downloads in order to work around this when it hit.

Thanks