uname -a
Linux francis-Lenovo 4.10.0-33-generic #37~16.04.1-Ubuntu SMP Fri Aug 11 14:07:24 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

sudo lshw -numeric -C net
sudo: unable to resolve host francis-Lenovo: Connection timed out
*-network
description: Wireless interface
product: RTL8821AE 802.11ac PCIe Wireless Network Adapter [10EC:8821]
vendor: Realtek Semiconductor Co., Ltd. [10EC]
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlp3s0
version: 00
serial: c8:3d:d4:a3:e6:99
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rtl8821ae driverversion=4.10.0-33-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11
resources: irq:333 ioport:4000(size=256) memory:a4200000-a4203fff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10EC:8168]
vendor: Realtek Semiconductor Co., Ltd. [10EC]
physical id: 0
bus info: pci@0000:04:00.0
logical name: enp4s0
version: 10
serial: 54:e1:ad:14:82:70
size: 1Gbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8168g-3_0.0.1 04/23/13 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s
resources: irq:322 ioport:3000(size=256) memory:a4104000-a4104fff memory:a4100000-a4103fff

sudo cat /etc/resolv.conf
sudo: unable to resolve host francis-Lenovo: Connection timed out
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1

sudo ls -l /etc/resolv.conf
sudo: unable to resolve host francis-Lenovo: Connection timed out
lrwxrwxrwx 1 root root 29 Aug 27 15:38 /etc/resolv.conf -> ../run/resolvconf/resolv.conf

sudo cat /etc/NetworkManager/NetworkManager.conf
sudo: unable to resolve host francis-Lenovo: Connection timed out
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq

[ifupdown]
managed=false

有看了网上一些文章说换去 iwlwifi new，但是安装重启之后，开了2分钟就直接完全不能连上。 product: RTL8821AE 802.11ac PCIe Wireless Network Adapter [10EC:8821]

您的网卡是 RTL8821AE，与 Intel 网卡驱动 'iwlwifi' 没关系。问题在于驱动质量不佳

参考
https://bugzilla.redhat.com/show_bug.cgi?id=1435793
https://github.com/lwfinger/rtlwifi_new/issues/235

编译这个驱动试试 https://github.com/lwfinger/rtlwifi_new

上文第二个帖子里有人提到的模块参数也试一下