Server 3.0.5557.20000 breaks web client access on Linux

[jbiddy]

Steps to reproduce

1. Have a working Ubuntu 14.04, Emby server 3.0.5556, package manager properly configured
2. Run sudo apt-get update and sudo apt-get upgrade to push 3.0.5557.20000
3. Try to visit your Emby server via app.mediabrowser.tv or your local hostname/ip address.

Expected behaviour

You should be viewing the server dashboard, Emby should be running a scan of the library, etc.

Actual behavior

After a very long attempt to load the dashboard, you get a connection error/connection failure from the web browser.

Server configuration

Ubuntu Server 14.04 fully updated
Emby server 3.0.5557.20000

Notes: Reported by at least two users in the Emby server/Ubuntu forum.