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Seldom behavior of the NetworkManager. Changed IP to static in KDE but on reboot the network interface was gone. Well, the card itself is listed but /sys/class/net only shows “lo”
Mr. google did not help as there are simple no hints how to trace down the problem.
As I said lspci shows the Realtek NIC but there is no way to get it back to the enP4-Blah-Blah-Blah name in /sys/class/net (Why, oh why can’t we have eth0 to 65536 again? and listed under /dev/…) Moan!