之前一直用小米的驱动，但是感觉太慢了，所以还是决定使用有线连接。
但是之前进入Linux系统后，有线连接没有，所以需要安装驱动。
进入windows系统，进入CMD命令行，输入systeminfo
查询网卡类型
网卡: 安装了 2 个 NIC。
[01]: Realtek PCIe 2.5GbE Family Controller
连接名: 以太网 2
启用 DHCP: 是
DHCP 服务器: 10.193.0.1
IP 地址
[01]: 10.193.194.9
[02]: fe80::9b6:1e28:e575:69cd
[03]: 2001:da8:1002:8040::2:939c
[02]: Xiaomi 802.11n USB Wireless Adapter
连接名: WLAN 2
状态: 媒体连接已中断
在 Ubuntu打开终端，输入lspci -v 查看网卡驱动
如果末尾显示：Kernel driver in use:r8169
说明驱动版本不符，需要重新安装驱动，要安装RTL8125
选择安装RTL8125，是根据windows查询到的网卡类型选择的
查询结果如下：
guyue@guyue:~$ lspci -v
00:00.0 Host bridge: Intel Corporation Device 9b53 (rev 03)
Subsystem: ASUSTeK Computer Inc. Device 8694
Flags: bus master, fast devsel, latency 0
Capabilities: <access denied>
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x16) (rev 03) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 120
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 00004000-00004fff
Memory behind bridge: 91000000-920fffff
Prefetchable memory behind bridge: 00000000a0000000-00000000b1ffffff
Capabilities: <access denied>
Kernel driver in use: pcieport
00:14.0 USB controller: Intel Corporation Device a3af (prog-if 30 [XHCI])
Subsystem: ASUSTeK Computer Inc. Device 8694
Flags: bus master, medium devsel, latency 0, IRQ 125
Memory at 4000010000 (64-bit, non-prefetchable) [size=64K]
Capabilities: <access denied>
Kernel driver in use: xhci_hcd
00:16.0 Communication controller: Intel Corporation Device a3ba
Subsystem: ASUSTeK Computer Inc. Device 8694
Flags: bus master, fast devsel, latency 0, IRQ 136
Memory at 4000025000 (64-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
Kernel driver in use: mei_me
Kernel modules: mei_me
00:17.0 SATA controller: Intel Corporation Device a382 (prog-if 01 [AHCI 1.0])
Subsystem: ASUSTeK Computer Inc. Device 8694
Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 126
Memory at 92304000 (32-bit, non-prefetchable) [size=8K]
Memory at 92307000 (32-bit, non-prefetchable) [size=256]
I/O ports at 5050 [size=8]
I/O ports at 5040 [size=4]
I/O ports at 5020 [size=32]
Memory at 92306000 (32-bit, non-prefetchable) [size=2K]
Capabilities: <access denied>
Kernel driver in use: ahci
Kernel modules: ahci
00:1b.0 PCI bridge: Intel Corporation Device a3e9 (rev f0) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 121
Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
I/O behind bridge: 00006000-00006fff
Memory behind bridge: 90000000-901fffff
Prefetchable memory behind bridge: 0000004000100000-00000040002fffff
Capabilities: <access denied>
Kernel driver in use: pcieport
00:1c.0 PCI bridge: Intel Corporation Device a392 (rev f0) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 122
Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
I/O behind bridge: 00007000-00007fff
Memory behind bridge: 90200000-903fffff
Prefetchable memory behind bridge: 0000004000300000-00000040004fffff
Capabilities: <access denied>
Kernel driver in use: pcieport
00:1c.3 PCI bridge: Intel Corporation Device a393 (rev f0) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 123
Bus: primary=00, secondary=04, subordinate=04, sec-latency=0
I/O behind bridge: 00003000-00003fff
Memory behind bridge: 92200000-922fffff
Capabilities: <access denied>
Kernel driver in use: pcieport
00:1d.0 PCI bridge: Intel Corporation Device a398 (rev f0) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 124
Bus: primary=00, secondary=05, subordinate=05, sec-latency=0
Memory behind bridge: 92100000-921fffff
Capabilities: <access denied>
Kernel driver in use: pcieport
00:1f.0 ISA bridge: Intel Corporation Device a3c8
Subsystem: ASUSTeK Computer Inc. Device 8694
Flags: bus master, medium devsel, latency 0
00:1f.2 Memory controller: Intel Corporation Device a3a1
Subsystem: ASUSTeK Computer Inc. Device 8694
Flags: fast devsel
Memory at 92300000 (32-bit, non-prefetchable) [disabled] [size=16K]
00:1f.3 Audio device: Intel Corporation Device a3f0
Subsystem: ASUSTeK Computer Inc. Device 8797
Flags: bus master, fast devsel, latency 32, IRQ 137
Memory at 4000020000 (64-bit, non-prefetchable) [size=16K]
Memory at 4000000000 (64-bit, non-prefetchable) [size=64K]
Capabilities: <access denied>
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel, snd_sof_pci
00:1f.4 SMBus: Intel Corporation Device a3a3
Subsystem: ASUSTeK Computer Inc. Device 8694
Flags: medium devsel, IRQ 11
Memory at 4000024000 (64-bit, non-prefetchable) [size=256]
I/O ports at efa0 [size=32]
01:00.0 VGA compatible controller: NVIDIA Corporation Device 1f0a (rev a1) (prog-if 00 [VGA controller])
Subsystem: ASUSTeK Computer Inc. Device 879b
Flags: bus master, fast devsel, latency 0, IRQ 142
Memory at 91000000 (32-bit, non-prefetchable) [size=16M]
Memory at a0000000 (64-bit, prefetchable) [size=256M]
Memory at b0000000 (64-bit, prefetchable) [size=32M]
I/O ports at 4000 [size=128]
Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: nouveau
Kernel modules: nvidiafb, nouveau
01:00.1 Audio device: NVIDIA Corporation Device 10f9 (rev a1)
Subsystem: ASUSTeK Computer Inc. Device 879b
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at 92080000 (32-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. Device 8125 (rev 04)
Subsystem: ASUSTeK Computer Inc. Device 87d7
Flags: fast devsel, IRQ 19
I/O ports at 3000 [size=256]
Memory at 92200000 (64-bit, non-prefetchable) [size=64K]
Memory at 92210000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel modules: r8169
05:00.0 Non-Volatile memory controller: Kingston Technology Company, Inc. Device 500e (rev 01) (prog-if 02 [NVM Express])
Subsystem: Kingston Technology Company, Inc. Device 500e
Flags: bus master, fast devsel, latency 0, IRQ 16, NUMA node 0
Memory at 92100000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: nvme
Kernel modules: nvme
进入官网
选择Linux下的 r8125 进行安装
下载下来的文件名为：r8125-9.007.01.tar.bz2
将此文件右键解压缩，然后把压缩文件复制到想要安装的位置
然后进入此目录下，运行以下指令
cd ~/software/r8125-9.007.01
sudo chmod +x autorun.sh
sudo ./autorun.sh
运行结果如下：
guyue@guyue:~/software/r8125-9.007.01$ sudo chmod +x autorun.sh
[sudo] guyue 的密码：
guyue@guyue:~/software/r8125-9.007.01$ sudo ./autorun.sh
Check old driver and unload it.
rmmod r8169
Build the module and install
At main.c:160:
- SSL error:02001002:system library:fopen:No such file or directory: ../crypto/bio/bss_file.c:72
- SSL error:2006D080:BIO routines:BIO_new_file:no such file: ../crypto/bio/bss_file.c:79
sign-file: certs/signing_key.pem: No such file or directory
Warning: modules_install: missing 'System.map' file. Skipping depmod.
Backup r8169.ko
rename r8169.ko to r8169.bak
DEPMOD 5.4.0-90-generic
load module r8125
Updating initramfs. Please wait.
update-initramfs: Generating /boot/initrd.img-5.4.0-90-generic
Completed.
安装完后运行以下指令，更新软件
sudo apt-get update
sudo apt-get install ubuntu-make
电脑重启以后，网络有线连接又没有了，然后重新运行下述代码，网络有限连接就又有了
cd ~/software/r8125-9.007.01
sudo chmod +x autorun.sh
sudo ./autorun.sh