The image x11docker/deepin is designed for and tested with x11docker.
synology is a different container application than docker.
I can't tell how to use synology to run a desktop. Likely it would be difficult.
On how to use x11docker/deepin with x11docker, look at README.md.
Log:
backend_syslog.go: 45: < info> syslog is not available: Unix syslog delivery error backend_syslog.go: 45: < info> syslog is not available: Unix syslog delivery error backend_syslog.go: 45: < info> syslog is not available: Unix syslog delivery error backend_syslog.go: 45: < info> syslog is not available: Unix syslog delivery error