更新了ubuntu20.04的内核后，缺失网卡驱动与无线网卡驱动，导致无法上网，需要重新安装网卡驱动，本教程仅适合ubuntu20.04安装I219-V有线网卡驱动，无线网卡驱动暂未解决。

1. 查看网卡型号

使用以下命令查看网卡型号，可以看到网卡为I219-V

lspci -v

2. 下载对应网卡驱动

在intel官网找到 点击下载e1000e-3.8.4.tar.gz

3. 解压对应网卡驱动

cd  ~/Downloads/
tar -xzvf e1000e-3.8.4.tar.gz

解压后会看到对应e1000e-3.8.4文件夹，文件夹内容如下

4. 安装网卡驱动

打开readme就能看到详细的安装方法，我们直接从第三步开始

To manually build the driver

1. Move the base driver tar file to the directory of your choice. For example, use ‘/home/username/e1000e’ or ‘/usr/local/src/e1000e’.
2. Untar/unzip the archive, where <x.x.x> is the version number for the driver tar file:

# tar zxf e1000e-<x.x.x>.tar.gz

————————————————从这里开始安装网卡驱动————————————————— 3. Change to the driver src directory, where <x.x.x> is the version number for the driver tar:

# cd e1000e-<x.x.x>/src/

4. Compile the driver module:

# make install

The binary will be installed as: /lib/modules//updates/drivers/net/ethernet/intel/e1000e/e1000e.ko

The install location listed above is the default location. This may differ for various Linux distributions.

5. Load the module using the modprobe command. To check the version of the driver and then load it:

# modinfo e1000e
   # modprobe e1000e

Alternately, make sure that any older e1000e drivers are removed from the kernel before loading the new module:

# rmmod e1000e; modprobe e1000e

——————————————————以下可以不用操作—————————————————— 6. Assign an IP address to the interface by entering the following, where is the interface name that was shown in dmesg after modprobe:

# ip address add <IP_address>/<netmask bits> dev <ethX>

7. Verify that the interface works. Enter the following, where IP_address is the IP address for another machine on the same subnet as the interface that is being tested:

# ping <IP_address>

—————————————————————重要—————————————————————— Note: For certain distributions like (but not limited to) Red Hat Enterprise Linux 7 and Ubuntu, once the driver is installed, you may need to update the initrd/initramfs file to prevent the OS loading old versions of the e1000e driver. Use the dracut utility on Red Hat distributions:

# dracut --force

For Ubuntu:

# update-initramfs -u

至此完成安装