ls /sys/class/net/
>> shows which nics are there, e.g:
br0 lo p5p1
>> p5p1 .. nothing was shown when running kernel 4.4.0-93

lspci -nnk |grep iA3 net
>> shows the ethernet device and which driver is loaded
>> here was no driver loaded

>> when starting a later kernel, you see the module and the driver is loaded
kernel: 4.4.0-96 contains module modnifo r8169
>> /lib/modules/4.4.0-96-generic/kernel/drivers/net/ethernet/realtek/r8169.ko

>> solution: upgraded just to 4.4.0-97 ;-))

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