Framebuffer Unsupported on Linux

Using OpenFrameworks 0.8.4 on ubuntu 14.04, I keep getting an error that says

ofFbo: FRAMEBUFFER_UNSUPPORTED

I've cut the code down to be the absolute minimal amount possible. It's just this:

void ofApp::setup(){
    fbo.allocate (ofGetWidth(), ofGetHeight(), GL_RGB32F_ARB);
    fbo.begin();
    ofClear(255);
    fbo.end();
}

and even that throws the error. I've never had this issue on Windows, and after doing a lot of googling I'm still lost. Has anyone else run into this?