Error running gzserver from an ubuntu server.

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So I'm trying to run a Gazebo server from an Ubuntu 16.04 instance, with no GUI.

when I run gzserver --verbose it outputs my ip settings (port 11345) and then this:

[Err] [RenderEngine.cc:726] Can't open display:

[Wrn] [RenderEngine.cc:93] Unable to create X window. Rendering will be disabled

[Wrn] [RenderEngine.cc:293] Cannot initialize render engine since render path type is NONE. Ignore this warning ifrendering has been turned off on purpose.

If I try and connect to it from another machine the client will output Exception sending a message for a while and then both the client and the server will output something like Aborted (core dumped).

Also, I tried running the server from an Ubuntu instance with a GUI. I didn't get the same [Err] and [Wrn] messages, but it still did the whole core dumped stuff.

Question 1: Can you run gzserver without a GUI?

Question 2: Any help on how to run a server like this? I haven't seen a tutorial on this exactly.

Thanks much!