Installing Designer on Ubuntu and Eclipse Oxygen 3a EE error Failed to star

Hello,

I have tried several times to install Vaadin Designer using the instructions from the Vaadin website (add new software - https://vaadin.com/eclipse). It installs okay but when Eclipse is restarted I get an error saying:

An internal error occurred during: “Initializing BrowserCore for Vaadin Designer”. Failed to start IPC process.

I am using Ubuntu 16.04 and 17.10, and tried on Eclipse Neon, Oxygen, EE and non EE. It happens every time I start Eclipse. When I press OK on the error dialog then the message just goes away and I can use Eclipse.

Any clues as to what the problem is?

Thanks, Mark.