Package: x2goclient, windows Version: 4.1.2.2, maybe others Firefox flags x2goclient-4.1.2.2-2020.02.13-setup.exe as a virus. No further information is provided. I found links to a folder with earlier versions from this page: https://wiki.x2go.org/doku.php/doc:installation:x2goclient x2goclient-4.1.2.0-2018.06.22-setup.exe was not flagged, indicating that the issue is in more recent builds. Workaround: Downloaded and installing the older version from here: https://code.x2go.org/releases/binary-win32/x2goclient/releases/4.1.2.0-2018.06.22/ [image: Capture.PNG]