用户ubuntu 16.04桌面版网卡驱动丢失，可参照以下步骤手动安装，此方法也适合ubuntu 18.04。

一、查看网卡型号：

lspci

二、官网下载对应网卡驱动，如：intel 15bb网卡

驱动手动安装步骤（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 \ is the version number for the driver tar file:

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

3. Change to the driver src directory, where \ 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/<KERNEL VER>/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 [parameter=port1_value,port2_value]
   

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

   rmmod e1000e; modprobe e1000e