Ethernet Connection Doesn't work

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http://askubuntu.com – Not sure what happened over the weekend (possibly the last sudo apt-get upgrade I ran this morning?), but I noticed that my computer's using my phone's internet connection (connected via USB and listed as "Wired Connection 2") instead of my ethernet connection ("Wired Connection 1"). I've tried restarting NetworkManager with sudo service network-manager start and stop, but that doesn't appear to fix anything. Rebooting doesn't change anything either. Adding my static IP address information to /etc/network/interfaces didn't help, so I removed that again. I tried the steps in this answer, (HowTos)