Modifying
/etc/NetworkManager/NetworkManager.conf didn't work for me. I've resorted to using ethernet. I'm going to attempt to downgrade wpasupplicant until this gets ironed out.
My network card: Broadcom Limited BCM4352
This is twice now that WiFi has been broken under Unstable on my desktop.
Edit: I wonder if the upgrade to the
broadcom-sta-dkms package might be the real issue. It was upgraded the same day (12/20/2016) as
wpasupplicant.
No recent open bug reports for the
broadcom-sta-dkms package.