My Ubuntu 12.04 droplet is on a x64 architecture. I'm running a Minecraft server, and I followed this tutorial: https://www.digitalocean.com/community/questions/how-to-install-64-bit-jdk-on-ubuntu-12-04 However, when I run "java -d64" I get this error: This Java instance does not support a 64-bit JVM. Please install the desired version. Why is this happening?