Hi. It seems to work, but still logs an error about the directory to stdout:
Warning: cannot use the system proxy for 'start' subcommand, failed to connect to '/run/xpra/system': [Errno 2] No such file or directory more information may be available in your system log 2018-09-22 00:08:12,217 Warning: failed to write script file in '/run/user/1000/xpra': 2018-09-22 00:08:12,217 [Errno 2] No such file or directory: '/run/user/1000/xpra' 2018-09-22 00:08:12,217 ($XDG_RUNTIME_DIR has not been created?) Entering daemon mode; any further errors will be reported to: /home/allo/.xpra/:10.log Alex