I noticed, In 16.04,
apt-get update downloads more data. Some of the big files include
DEP-11 things which I don't know much about.
I have found a Debian Wiki page https://wiki.debian.org/AppStream, which says these files YAML-formatted metadata provided for ---
The metadata can for example be used by software centers like GNOME Software or KDE Discover to display a user-friendly application-centric way on the package archive.
But, I don't use these Software Centers and I don't want to fetch those huge files. How do I disable fetching of these wastes?