I'm trying to use the portable version (no mono) of the client on Linux Mint. When I try to connect to a server I get an error "OpenVPN is already running". I don't think I have anything running in background that would cause this message to appear. I have one more VPN client installed on my machine from other provider but I have to manually start it. I checked on System Monitor for processes with "vpn" in name and I didn't find anything. Do you know what may cause this and how to solve the issue?