Repeatedly print "IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready"

Along with:
IPv6: ADDRCONF(NETDEV_UP): p2p0: link is not ready

These two line of log are printed repeatedly by a interval about 5mins.
What do these mean??
My system is the official debian buster for Pi S.
Only ethernet port is connected in my system.

I’m not sure… But I have IPv6 disabled on my router. I assumed that the board was ‘looking’ for it every so often and not finding it.

Maybe check your IP / router settings?