The other day I did an apt-get upgrade on my server, and it totally hosed my WordPress installation. Whoops. Apparently it is common knowledge in WordPress circles not to use the Debian WordPress package. My bad.
Luckily I had good backups and I was able to easily restore the site. This along with CryptoLocker, has given me a renewed appreciation for good backups, and I should probably work to improve what I currently have in place.