Seems like your WiFi USB dongle is detected as an Ethernet device:
QuoteDisplay MoreApr 11 16:28:37 LibreELEC kernel: usb 1-1.1: new high-speed USB device number 3 using dwc_otg
Apr 11 16:28:37 LibreELEC kernel: usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00, bcdDevice= 2.00
Apr 11 16:28:37 LibreELEC kernel: usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
Apr 11 16:28:37 LibreELEC kernel: smsc95xx v1.0.6
Apr 11 16:28:37 LibreELEC kernel: smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-3f980000.usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:fe:e7:88
Apr 11 16:28:37 LibreELEC kernel: usb 1-1.2: new high-speed USB device number 4 using dwc_otg
Apr 11 16:28:37 LibreELEC kernel: usb 1-1.2: New USB device found, idVendor=13b1, idProduct=003f, bcdDevice= 0.00
Apr 11 16:28:37 LibreELEC kernel: usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Apr 11 16:28:37 LibreELEC kernel: usb 1-1.2: Product: WUSB6300
Apr 11 16:28:37 LibreELEC kernel: usb 1-1.2: Manufacturer: Linksys
Apr 11 16:28:37 LibreELEC kernel: usb 1-1.2: SerialNumber: 26
So I think the driver is missing for that dongle. Use a different one.