So I upgraded to kernel 3.19.0, which went fine except that the wireless card stopped working. I would have searched for the driver for the wireless card, except that I'm on a laptop with no ethernet port, so if the wireless is gone, there's no internet.
I made a Timeshift backup before I started, and was able to restore my system to the pre-upgrade state, which is where I am now.
Anyone have some advice on how to make the wireless card work after upgrading? Or should I hold out until the next kernel upgrade?