When I execute:

$ cat /sys/class/net/*/address

I get:

f4:b5:20:23:9a:a4
00:00:00:00:00:00

The 1st is my ethernet MAC address, and the 2nd is, I guess (I'm not an expert on those things), my computer's MAC address. The computer works fine despite this all-zero address. However, I am having trouble to register a software online, because the registration process requires a "real" MAC address and an all-zero address is not acceptable.

Why is that and what should I do (if anything)?

Ubuntu 20.04 (Xfce) 64-bit.

Thanks.

2

1 Answer

Your are throwing out useful information with your method. Information which tells you which interface corresponds to which MAC address. Do this instead:

~$ grep . /sys/class/net/*/address
/sys/class/net/enp2s0/address:00:19:b9:0d:af:fa
/sys/class/net/enp4s0/address:00:22:b0:75:c2:bd
/sys/class/net/lo/address:00:00:00:00:00:00

And therefore we observe that is the local loopback interface, lo, with the all 0's MAC address.

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