I am using Vivado on Ubuntu 16.04.1 LTS.
I can open the Vivado License Manager (VLM) without issue but when I attempt any action that requires internet access (for example, "Obtain a license" "Connect Now", etc...) VLM displays a message similar to the following:
Note: I am using the Firefox web browser.
VLM sets the dynamic link library path (LD_LIBRARY_PATH) for itself when it is invoked, and this is not standard in Ubuntu 16.04.1.
As a result, when the browser is launched there is an incompatibility between the Browser and the dynamic linked libraries found in the LD_LIBRARY_PATH set by VLM.
This will be fixed in a future release.
A possible work-around is to create a small script that unsets the LD_LIBRARY_PATH and then launches your default browser, then update your environment to make this script the default browser.