USN-3156-1 fixed vulnerabilities in APT. It also caused a bug in unattended-upgrades on that may require manual intervention to repair.
Users on Ubuntu 16.10 should run the following commands at a terminal:
sudo dpkg --configure --pending sudo apt-get -f install
This update fixes the problem.
We apologize for the inconvenience.
Original advisory details:
Jann Horn discovered that APT incorrectly handled InRelease files. If a remote attacker were able to perform a man-in-the-middle attack, this flaw could potentially be used to install altered packages.
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