I apologize for not updating my comment sooner. My issue turned out to be a misconfiguration in my firewall. I suspect that others who are experiencing this issue may also have firewall misconfigurations or other network connectivity issues external to the core ubuntu install.
I apologize for not updating my comment sooner. My issue turned out to be a misconfiguration in my firewall. I suspect that others who are experiencing this issue may also have firewall misconfigurations or other network connectivity issues external to the core ubuntu install.