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When I open System Settings > Network > Wired and click options, it responds with the 'Error' How do I fix this?

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2 Answers 2

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Search Ubuntu: Enter "Network connection" -> Add > Ethernet -> set Automantic(DHCP) at Ipv4 and tick "require ipv4 addressing for..." -> Save.

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  • Nothing happens after I click save.
    – khatchad
    Sep 5, 2017 at 17:39
  • It still says "unmanaged."
    – khatchad
    Sep 5, 2017 at 17:42
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It seems like MAC address of interface is not configured or changed: open /etc/NetworkManager/system-connections/eth0 (if your interface eth1 then open that) and verify MAC address is correctly added or if not added then add like :

mac-address=DC:A9:71:59:9F:AC

your correct MAC address solve your problem. if not then you can generate UUID for interface.

uuidgen eth0
ffc3c3a4-6c82-457b-8f58-7d99db1813c1

and add manually /etc/NetworkManager/system-connections/eth0

uuid=ffc3c3a4-6c82-457b-8f58-7d99db1813c1
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