Ubuntu 16.04 apt-get update doesn't work with local repository
for use with apt 1.2 in Ubuntu 16.04 with local repository you need remove this file:
/etc/apt/apt.conf.d/50appstream
using:
sudo rm /etc/apt/apt.conf.d/50appstream
For me, alone deleting
/etc/apt/apt.conf.d/50appstream
didn't work, because I had downloaded only the amd64 packages. To get it to work, I had add the architecture to the sources.list lines
deb [arch=amd64] file:/wherever xenial main restricted universe multiverse
...etc.
After doing this apt-get update worked fine.