I just noticed that in debconf questions I can't arrow up/down, but I can tab and enter. I tried rolling back to the previous version of debconf but that didn't fix it. This repros on 2 PCs. I tried rolling back gettext/whiptail/libnewt that got updated in Sid a couple days ago -- no joy. I am now rolling back to the pacakges I had installed on 2/10 to see if that fixes it. I have no idea what package is broken.