ATLAS / DE0 Web Server not connecting in Ubuntu

Under Windows (10) I can connect to the ATLAS board, access the start.html, use the board as a web server (, and connect using PUTTY, but not in Ubuntu 15.10. From that I can connect only see the drive contents. For the web server problem I have tried Chrome and FireFox. I can take the device and move the connection from one machine to the other with these results.

Has anyone else seen this?

I have since found that I can communicate in Windows using the J2 port with Putty, but on Linux I must use J4 which I can connect to using minicom. I cannot connect to using the device as a webserver. J2 does not show up as a port in Linux. Has anyone else seen this issue?