我有一台英特尔 NUC6CAY，主板上有“LAN Realtek 8111HN”。但它没有出现。我使用全新安装的 Ubuntu 20.04。因为之前的 Mint 安装在更新到 20.04 后也出现了同样的问题。在 20.04 之前我使用的是 19.x 或 18.x，不记得了。但 LAN 正常工作。
编辑：BIOS 更新对我有用。请参阅下面的更新输出
ifconfig -a
显示 lo 和 wlp2s0（WLAN）。
lspci -nnk |grep -a3 Ethernet什么也没显示。
dmesg |grep e1000e
[ 198.740755] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
[ 198.740758] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
sudo lshw -C network
*-network
Beschreibung: Kabellose Verbindung
Produkt: Dual Band Wireless-AC 3168NGW [Stone Peak]
Hersteller: Intel Corporation
Physische ID: 0
Bus-Informationen: pci@0000:02:00.0
Logischer Name: wlp2s0
Version: 10
Seriennummer: de:ad:co:de:ba:se
Breite: 64 bits
Takt: 33MHz
Fähigkeiten: pm msi pciexpress bus_master cap_list ethernet physical wireless
Konfiguration: broadcast=yes driver=iwlwifi driverversion=5.4.0-42-generic firmware=29.1654887522.0 ip=192.168.2.42 latency=0 link=yes multicast=yes wireless=IEEE 802.11
Ressourcen: irq:129 memory:91100000-91101fff
r8168-8.048.03.tar.bz2所有这些 C&P 都是在我下载并编译后完成的https://www.realtek.com/en/component/zoo/category/network-interface-controllers-10-100-1000m-gigabit-ethernet-pci-express-software。
我不是普通的 unix 用户。所有这些都是通过不系统的研究和尝试错误完成的。
关于如何使用以太网连接，有什么建议吗？
更新/编辑：
sudo journalctl -b 0返回超过 11,000 行日志。查找eth
给了我systemd-udevd[378]: ethtool: autonegotiation is unset or enabled, the speed and duplex are not writable. kernel: Bluetooth: BNEP (Ethernet Emulation) ver 1.3
也许你可以指定你在寻找什么。没有找到任何关于 realtek（声卡除外）千兆位、以太网的信息
我删除了下一个日志中的所有数学行(.*)\(wlp2s0\):(.*)\n：
sudo journalctl /usr/sbin/NetworkManager
-- Reboot --
Aug 12 22:14:24 homerunner NetworkManager[717]: <info> [1597263264.9381] NetworkManager (version 1.22.10) is starting... (for the first time)
Aug 12 22:14:24 homerunner NetworkManager[717]: <info> [1597263264.9383] Read config: /etc/NetworkManager/NetworkManager.conf (lib: 10-dns-resolved.conf, 20-connectivity-ubuntu.conf, no-mac-addr-change.conf) (run: 10-globally-managed-devices.conf) (etc: default-wifi-powersave-on.conf)
Aug 12 22:14:24 homerunner NetworkManager[717]: <info> [1597263264.9854] bus-manager: acquired D-Bus service "org.freedesktop.NetworkManager"
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.0048] manager[0x5562be1cf030]: monitoring kernel firmware directory '/lib/firmware'.
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.0049] monitoring ifupdown state file '/run/network/ifstate'.
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.3240] hostname: hostname: using hostnamed
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.3241] hostname: hostname changed from (none) to "homerunner"
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.3246] dns-mgr[0x5562be1b7290]: init: dns=systemd-resolved rc-manager=symlink, plugin=systemd-resolved
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.3322] rfkill0: found Wi-Fi radio killswitch (at /sys/devices/pci0000:00/0000:00:13.1/0000:02:00.0/ieee80211/phy0/rfkill0) (driver iwlwifi)
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.3333] manager[0x5562be1cf030]: rfkill: Wi-Fi hardware radio set enabled
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.3333] manager[0x5562be1cf030]: rfkill: WWAN hardware radio set enabled
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.3576] Loaded device plugin: NMWifiFactory (/usr/lib/x86_64-linux-gnu/NetworkManager/1.22.10/libnm-device-plugin-wifi.so)
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.3665] Loaded device plugin: NMTeamFactory (/usr/lib/x86_64-linux-gnu/NetworkManager/1.22.10/libnm-device-plugin-team.so)
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.3877] Loaded device plugin: NMAtmManager (/usr/lib/x86_64-linux-gnu/NetworkManager/1.22.10/libnm-device-plugin-adsl.so)
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.4009] Loaded device plugin: NMBluezManager (/usr/lib/x86_64-linux-gnu/NetworkManager/1.22.10/libnm-device-plugin-bluetooth.so)
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.4026] Loaded device plugin: NMWwanFactory (/usr/lib/x86_64-linux-gnu/NetworkManager/1.22.10/libnm-device-plugin-wwan.so)
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.4032] manager: rfkill: Wi-Fi enabled by radio killswitch; enabled by state file
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.4036] manager: rfkill: WWAN enabled by radio killswitch; enabled by state file
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.4037] manager: Networking is enabled by state file
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.4039] dhcp-init: Using DHCP client 'internal'
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.4095] settings: Loaded settings plugin: ifupdown ("/usr/lib/x86_64-linux-gnu/NetworkManager/1.22.10/libnm-settings-plugin-ifupdown.so")
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.4096] settings: Loaded settings plugin: keyfile (internal)
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.4097] ifupdown: management mode: unmanaged
Aug 12 22:14:25 homerunner NetworkManager[717]: <warn> [1597263265.4104] ifupdown: interfaces file /etc/network/interfaces doesn't exist
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.4192] device (lo): carrier: link connected
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.4198] manager: (lo): new Generic device (/org/freedesktop/NetworkManager/Devices/1)
Aug 12 22:14:25 homerunner NetworkManager[717]: <warn> [1597263265.4977] Error: failed to open /run/network/ifstate
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.5160] modem-manager: ModemManager available
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.5218] supplicant: wpa_supplicant running
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.6484] sup-iface[0x5562be1dc120,wlp2s0]: supports 5 scan SSIDs
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.6530] Wi-Fi P2P device controlled by interface wlp2s0 created
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.6540] manager: (p2p-dev-wlp2s0): new 802.11 Wi-Fi P2P device (/org/freedesktop/NetworkManager/Devices/3)
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.6554] device (p2p-dev-wlp2s0): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
Aug 12 22:14:25 homerunner NetworkManager[717]: <info> [1597263265.6577] device (p2p-dev-wlp2s0): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'managed')
Aug 12 22:14:25 homerunner NetworkManager[717]: <warn> [1597263265.6694] sup-iface: failed to cancel p2p connect: P2P cancel failed
Aug 12 22:14:28 homerunner NetworkManager[717]: <info> [1597263268.9714] policy: auto-activating connection 'NetofNet' (275c1c77-ac5b-4117-8803-a0ae7870c34e)
Aug 12 22:14:28 homerunner NetworkManager[717]: <info> [1597263268.9767] manager: NetworkManager state is now CONNECTING
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.0003] Config: added 'ssid' value 'NetofNet'
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.0003] Config: added 'scan_ssid' value '1'
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.0004] Config: added 'bgscan' value 'simple:30:-70:86400'
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.0004] Config: added 'key_mgmt' value 'WPA-PSK WPA-PSK-SHA256 FT-PSK'
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.0004] Config: added 'auth_alg' value 'OPEN'
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.0004] Config: added 'psk' value '<hidden>'
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.0194] device (p2p-dev-wlp2s0): supplicant management interface state: ready -> authenticating
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.0220] device (p2p-dev-wlp2s0): supplicant management interface state: authenticating -> associating
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.0340] device (p2p-dev-wlp2s0): supplicant management interface state: associating -> associated
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.0437] device (p2p-dev-wlp2s0): supplicant management interface state: associated -> 4-way handshake
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.0921] device (p2p-dev-wlp2s0): supplicant management interface state: 4-way handshake -> completed
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.1406] manager: NetworkManager state is now CONNECTED_LOCAL
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.1500] manager: NetworkManager state is now CONNECTED_SITE
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.1512] policy: set 'NetofNet' (wlp2s0) as default for IPv4 routing and DNS
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.1555] manager: startup complete
Aug 12 22:14:29 homerunner NetworkManager[717]: <info> [1597263269.4590] manager: NetworkManager state is now CONNECTED_GLOBAL
Aug 12 22:14:30 homerunner NetworkManager[717]: <info> [1597263270.5744] policy: set 'NetofNet' (wlp2s0) as default for IPv6 routing and DNS
Aug 12 22:14:33 homerunner NetworkManager[717]: <info> [1597263273.1526] agent-manager: agent[a5afc4246fa6048e,:1.44/org.gnome.Shell.NetworkAgent/1000]: agent registered
BIOS 更新后的输出
ifconfig -a
enp3s0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 94:c6:91:a2:3f:b2 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 128 base 0x5000
...
sudo lshw -C network
*-network
Beschreibung: Kabellose Verbindung
Produkt: Dual Band Wireless-AC 3168NGW [Stone Peak]
Hersteller: Intel Corporation
Physische ID: 0
Bus-Informationen: pci@0000:02:00.0
Logischer Name: wlp2s0
Version: 10
Seriennummer: 34:e1:2d:ca:77:86
Breite: 64 bits
Takt: 33MHz
Fähigkeiten: pm msi pciexpress bus_master cap_list ethernet physical wireless
Konfiguration: broadcast=yes driver=iwlwifi driverversion=5.4.0-42-generic firmware=29.1654887522.0 ip=192.168.0.25 latency=0 link=yes multicast=yes wireless=IEEE 802.11
Ressourcen: irq:130 memory:91200000-91201fff
*-network
Beschreibung: Ethernet interface
Produkt: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
Hersteller: Realtek Semiconductor Co., Ltd.
Physische ID: 0
Bus-Informationen: pci@0000:03:00.0
Logischer Name: enp3s0
Version: 15
Seriennummer: 94:c6:91:a2:3f:b2
Kapazität: 1Gbit/s
Breite: 64 bits
Takt: 33MHz
Fähigkeiten: pm msi pciexpress msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
Konfiguration: autonegotiation=on broadcast=yes driver=r8168 driverversion=8.048.00-NAPI latency=0 link=no multicast=yes port=twisted pair
Ressourcen: irq:128 ioport:e000(Größe=256) memory:91104000-91104fff memory:91100000-91103fff