So, I attempted to use the apt-get binaries to install gns3-server on Ubuntu 18.04 LTS (Bionic Beaver). The issue I ran into is that the package is linked to a specific version of python3. The installation was linked to the python3 version 3.5 libraries as evidenced by the output:
cp: cannot stat '/usr/bin/python3.5': No such file or directory
So, in connecting my virtual gns3 network to my local, physical lan, I found the connection speeds to be abysmal. Host to host speeds within the virtual network were good but communicating from a virtual host to a physical host had speeds around 10kbps.
Some poking around on Google revealed that this is a common problem. I was able to solve this by following the advice in this article. Read more