Latest Chromium 55 user agents:

User Agent Platform Device
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/55.0.2883.87 Chrome/55.0.2883.87 Safari/537.36 Ubuntu Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/55.0.2883.75 Chrome/55.0.2883.75 Safari/537.36 Ubuntu Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/55.0.2883.87 Chrome/55.0.2883.87 Safari/537.36 Ubuntu Unknown
Mozilla/5.0 (Linux; Ubuntu 16.04) AppleWebKit/537.36 Chromium/55.0.2883.75 Safari/537.36 Ubuntu 16 Unknown
Mozilla/5.0 (Linux; Ubuntu 16.04 like Android 4.4) AppleWebKit/537.36 Chromium/55.0.2883.75 Mobile Safari/537.36 Ubuntu 16 Unknown
Mozilla/5.0 (Linux; Ubuntu 15.04) AppleWebKit/537.36 Chromium/55.0.2883.75 Safari/537.36 Ubuntu 15 Unknown
Mozilla/5.0 (Linux; Ubuntu 15.04 like Android 4.4) AppleWebKit/537.36 Chromium/55.0.2883.75 Mobile Safari/537.36 Ubuntu 15 Unknown