Normally not a problem if it runs as repetierserver. You need permission to see the files, that is why repetierserver is member of dial group. Do you see any ports? Sure port is available in linux with that name? If you login using ssh a simple ls /dev should show you all devices. while ls /dev/serial/by-id shows all known serial devices connected.
Comments
ls /dev
should show you all devices. while
ls /dev/serial/by-id
shows all known serial devices connected.
but it is not included in the port list
lsusb
to see if your printer is seen at all on usb connection. Then you also know what kind of usb driver you need to enable/google for.