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尽管存在 PCI 以太网连接，但 ubuntu 18.04 每次重启时都会打开 USB 以太网连接

tag-icon • tag-icon networking 18.04 20.04 usb ethernet
尽管存在 PCI 以太网连接，但 ubuntu 18.04 每次重启时都会打开 USB 以太网连接

我有 Ubuntu 18.04 和 PCI 以太网电缆（已连接）。当我启动机器时，它总是尝试打开 USB 以太网连接。我可以使用屏幕右上角的菜单关闭此功能，但这种关闭不是持久的：下次重新启动时，它会再次尝试打开 USB 以太网连接。

我怎样才能永久关闭它？

编辑：添加了一些输出

输出lsusb：

 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 005: ID 04f2:b51d Chicony Electronics Co., Ltd 
 Bus 001 Device 004: ID 8087:0a2b Intel Corp. 
 Bus 001 Device 003: ID 03f0:9d1d Hewlett-Packard 
 Bus 001 Device 002: ID 046d:c050 Logitech, Inc. RX 250 Optical Mouse
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

输出lspci

 00:00.0 Host bridge: Intel Corporation Skylake Host Bridge/DRAM Registers (rev 08)
 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520 (rev 07)
 00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
 00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
 00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller #0 (rev 21)
 00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)
 00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] (rev 21)
 00:1c.0 PCI bridge: Intel Corporation Device 9d11 (rev f1)
 00:1c.3 PCI bridge: Intel Corporation Device 9d13 (rev f1)
 00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21)
 00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
 00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev      21)
 00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
 00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection I219-V (rev 21)
 01:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader (rev 01)
 02:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)

EDIT2：输出ip link show（ifconfig -a |grep Link不产生输出）

 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
 2: enp0s31f6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
     link/ether 10:e7:c6:6c:59:b3 brd ff:ff:ff:ff:ff:ff
 3: enp0s20f0u3c2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
     link/ether 26:b7:4e:09:a6:4a brd ff:ff:ff:ff:ff:ff
 4: wlp2s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ether 68:ec:c5:c0:78:e4 brd ff:ff:ff:ff:ff:ff

编辑 3：输出sudo lshw -class network

 *-network DISABLED        
      description: Wireless interface
      product: Wireless 8260
      vendor: Intel Corporation
      physical id: 0
      bus info: pci@0000:02:00.0
      logical name: wlp2s0
      version: 3a
      serial: 68:ec:c5:c0:78:e4
      width: 64 bits
      clock: 33MHz
      capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
      configuration: broadcast=yes driver=iwlwifi driverversion=4.15.0-34-generic firmware=34.0.1 latency=0 link=no multicast=yes wireless=IEEE 802.11
      resources: irq:128 memory:e1100000-e1101fff
 *-network
      description: Ethernet interface
      product: Ethernet Connection I219-V
      vendor: Intel Corporation
      physical id: 1f.6
      bus info: pci@0000:00:1f.6
      logical name: enp0s31f6
      version: 21
      serial: 10:e7:c6:6c:59:b3
      size: 100Mbit/s
      capacity: 1Gbit/s
      width: 32 bits
      clock: 33MHz
      capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
      configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=0.13-4 ip=134.96.90.25 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
      resources: irq:125 memory:e1200000-e121ffff
 *-network
      description: Ethernet interface
      physical id: 2
      logical name: enp0s20f0u3c2
      serial: 72:63:21:bf:e2:28
      capabilities: ethernet physical
      configuration: broadcast=yes driver=cdc_ether driverversion=22-Aug-2005 firmware=CDC Ethernet Device link=yes multicast=yes

PS：在 Ubuntu 20.04 下行为仍然相同

答案1

8 年前有人问过类似的问题（也是悬赏）：启动时禁用无线

接受的答案是：

禁用该卡的方法有很多种。我认为最简单的方法是：

sudo ifdown enp0s20f0u3c2

在您的/etc/rc.local上面exit 0。这应该禁用无线网卡（wlan0用您的无线接口卡替换）

如果您想在按下键盘时启用/禁用，Ubuntu 论坛上的这个帖子解释了如何将键盘事件链接到脚本。如果您想在按下按键时切换，则必须向脚本添加一些逻辑。不过最简单的方法可能是让一个键启用，另一个键禁用。

向下脚本

#!/bin/bash
IFACE=enp0s20f0u3c2
ifconfig ${IFACE} down

及以上脚本

#!/bin/bash
IFACE=enp0s20f0u3c2
ifconfig ${IFACE} up

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