Realtek 8153 based USB Ethernet adaptor on Debian Linux

I received my Lenovo Ethernet USB 3 adaptor based on Realtek 8153 and it identified well on my PC:

4021.908466] usb 1-1: USB disconnect, device number 6

[ 4021.908858] r8152 1-1:1.0 enx606d3cece3ed: Stop submitting intr, status -108

[ 4023.337656] usb 1-1: new high-speed USB device number 7 using xhci_hcd

[ 4024.434537] usb 1-1: New USB device found, idVendor=17ef, idProduct=720c, bcdDevice=30.00

[ 4024.434542] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=6

[ 4024.434543] usb 1-1: Product: Lenovo USB-C to LAN

[ 4024.434545] usb 1-1: Manufacturer: Lenovo

[ 4024.434545] usb 1-1: SerialNumber: ECE3ED000000

[ 4024.599450] usb 1-1: reset high-speed USB device number 7 using xhci_hcd

[ 4025.532652] r8152 1-1:1.0: load rtl8153a-3 v2 02/07/20 successfully

Sadly when I plugged it to my SBC RockPro64 I got following:

[ 4182.236792] usb 7-1: new high-speed USB device number 2 using xhci-hcd

[ 4182.386057] usb 7-1: New USB device found, idVendor=17ef, idProduct=720c, bcdDevice=30.00

[ 4182.386108] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=6

[ 4182.386132] usb 7-1: Product: Lenovo USB-C to LAN

[ 4182.386152] usb 7-1: Manufacturer: Lenovo

[ 4182.386171] usb 7-1: SerialNumber: ECE3ED000000

[ 4182.440134] usbcore: registered new interface driver r8152

[ 4182.448147] usbcore: registered new interface driver cdc_ether

[ 4182.610609] usb 7-1: reset high-speed USB device number 2 using xhci-hcd

[ 4182.800168] r8152 7-1:1.0: firmware: failed to load rtl_nic/rtl8153a-3.fw (-2)

[ 4182.800868] firmware_class: See https://wiki.debian.org/Firmware for information about missing firmware

[ 4182.801738] r8152 7-1:1.0: firmware: failed to load rtl_nic/rtl8153a-3.fw (-2)

[ 4182.802385] r8152 7-1:1.0: Direct firmware load for rtl_nic/rtl8153a-3.fw failed with error -2

[ 4182.802401] r8152 7-1:1.0: unable to load firmware patch rtl_nic/rtl8153a-3.fw (-2)

[ 4182.839821] r8152 7-1:1.0 eth0: v1.12.13

[ 4182.880701] r8152 7-1:1.0 enx606d3cece3ed: renamed from eth0

To address it we need to add non-free repository to list of standard Ubuntu repos by adding non-free after main in /etc/apt/sources.list like this:

deb http://deb.debian.org/debian/ debian-code-name main non-free

And then install firmwares:

sudo apt-get update

sudo apt-get install -y firmware-realtek 

After that unplug USB adaptor and plug it again.

In my case I got following successful identification: 

[ 4778.769681] usb 7-1: new high-speed USB device number 4 using xhci-hcd

[ 4809.225536] usb 7-1: new high-speed USB device number 5 using xhci-hcd

[ 4809.374948] usb 7-1: New USB device found, idVendor=17ef, idProduct=720c, bcdDevice=30.00

[ 4809.375000] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=6

[ 4809.375024] usb 7-1: Product: Lenovo USB-C to LAN

[ 4809.375044] usb 7-1: Manufacturer: Lenovo

[ 4809.375063] usb 7-1: SerialNumber: ECE3ED000000

[ 4809.570774] usb 7-1: reset high-speed USB device number 5 using xhci-hcd

[ 4809.738340] r8152 7-1:1.0: firmware: direct-loading firmware rtl_nic/rtl8153a-3.fw

[ 4809.760907] r8152 7-1:1.0: load rtl8153a-3 v2 02/07/20 successfully

[ 4809.790911] r8152 7-1:1.0 eth0: v1.12.13

[ 4809.831468] r8152 7-1:1.0 enx606d3cece3ed: renamed from eth0