https://www.hcaijin.com/kernel-upgrade-fix-rtl8821ce/
查看无线驱动信息
通过ip l可以看到只有有线网卡
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: enp3s0: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000
link/ether 8c:16:45:3f:68:0d brd ff:ff:ff:ff:ff:ff
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查看无线网卡驱动，找到相应的驱动去下载就好了
lspci | grep -i 'newwork'
Network controller: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter
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下载无线驱动源码
git clone https://github.com/endlessm/linux
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由于这个项目特别的大，这里只需要下载drivers/net/wireless/rtl8821ce
编译
修改Makefile
这里需要修改Makefile中TopDIR变量的值为当前路径，否则会提示错误退出
cd drivers/net/wireless/rtl8821ce
sed -i 's/export TopDIR ?=/export TopDIR ?= $(shell pwd)/g' Makefile
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执行make
在最新的内核版本（4.16.9-1-ARCH）下编译失败，提示如下：
graz@graz ~/Source/driver_net_wireless/rtl8821ce % make
/usr/bin/make ARCH=x86_64 CROSS_COMPILE= -C /lib/modules/4.16.9-1-ARCH/build M=/home/graz/Source/driver_net_wireless/rtl8821ce modules
make[1]: Entering directory '/usr/lib/modules/4.16.9-1-ARCH/build'
CC [M] /home/graz/Source/driver_net_wireless/rtl8821ce/core/rtw_cmd.o
In file included from ./include/linux/list.h:9,
from ./include/linux/module.h:9,
from /home/graz/Source/driver_net_wireless/rtl8821ce/include/basic_types.h:81,
from /home/graz/Source/driver_net_wireless/rtl8821ce/include/drv_types.h:31,
from /home/graz/Source/driver_net_wireless/rtl8821ce/core/rtw_cmd.c:22:
./include/linux/kernel.h:6:10: fatal error: stdarg.h: No such file or directory
#include <stdarg.h>
^~~~~~~~~~
compilation terminated.
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通过locate stdarg.h找到头文件 “/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/include/stdarg.h”
ln -s /usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/include/stdarg.h include/
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软链接创建好后，就可以执行make编译成功
安装
sudo make install
modprobe 8821ce
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最后，没有报错的话，通过ip l 就可以找到这个无线网卡了
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: enp3s0: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000
link/ether 8c:16:45:3f:68:0d brd ff:ff:ff:ff:ff:ff
3: wlp5s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DORMANT group default qlen 1000
link/ether 70:c9:4e:d8:6d:01 brd ff:ff:ff:ff:ff:ff