I was trying to look at the differences between the two files that unattended upgrades was asking me about. And while resizing the windows, I accidentally hit to keep the old file /etc/apt/apt.conf.d/20auto-upgrades.ucf-dist. Now I get this message whenever I install a software package :
N: Ignoring file '20auto-upgrades.ucf-dist' in directory '/etc/apt/apt.conf.d/'