Thanks Aaron for your  suggestion.  I followed your instructions.  Now 
Discover recognizes that it's online.   The network manager gui still 
isn't there.  I tried nmcli.

$ nmcli -a
enp5s0: unmanaged
         "Realtek RTL8111/8168/8411"
         ethernet (r8169), 00:1A:4D:93:EF:2F, hw, mtu 1500

lo: unmanaged
         "lo"
         loopback (unknown), 00:00:00:00:00:00, sw, mtu 65536

How do I tell network manager to manage the connection?  I checked 
/etc/NetworkManager/NetworkManager.conf.  I changed false to true, 
rebooted but no effect.

[main]
plugins=ifupdown,keyfile

[ifupdown]
#managed=false
managed=true

[device]
wifi.scan-rand-mac-address=no

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