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昨天安装了Ubuntu18.04发现没有wifi，未发现wifi适配器，我是win10和Ubuntu双系统，刚上手Ubuntu，下面是输出的信息，看看有没有帮助。
eartsilence@heartsilence-PC:~$ uname -a
Linux heartsilence-PC 4.15.0-43-generic #46-Ubuntu SMP Thu Dec 6 14:45:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
heartsilence@heartsilence-PC:~$ lspci
00:00.0 Host bridge: Intel Corporation Device 3e30 (rev 0a)
00:01.0 PCI bridge: Intel Corporation Skylake PCIe Controller (x16) (rev 0a)
00:14.0 USB controller: Intel Corporation 200 Series PCH USB 3.0 xHCI Controller
00:14.2 Signal processing controller: Intel Corporation 200 Series PCH Thermal Subsystem
00:16.0 Communication controller: Intel Corporation 200 Series PCH CSME HECI #1
00:17.0 SATA controller: Intel Corporation 200 Series PCH SATA controller [AHCI mode]
00:1c.0 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #1 (rev f0)
00:1c.1 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #2 (rev f0)
00:1c.3 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #4 (rev f0)
00:1c.4 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #5 (rev f0)
00:1d.0 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #9 (rev f0)
00:1d.5 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #14 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Device a2c9
00:1f.2 Memory controller: Intel Corporation 200 Series PCH PMC
00:1f.3 Audio device: Intel Corporation 200 Series PCH HD Audio
00:1f.4 SMBus: Intel Corporation 200 Series PCH SMBus Controller
01:00.0 VGA compatible controller: NVIDIA Corporation GP104M [GeForce GTX 1080 Mobile] (rev a1)
01:00.1 Audio device: NVIDIA Corporation GP104 High Definition Audio Controller (rev a1)
02:00.0 Ethernet controller: Qualcomm Atheros Killer E2500 Gigabit Ethernet Controller (rev 10)
03:00.0 Ethernet controller: Qualcomm Atheros Killer E2500 Gigabit Ethernet Controller (rev 10)
04:00.0 SD Host controller: Realtek Semiconductor Co., Ltd. RTS5250 PCI Express Card Reader (rev 01)
70:00.0 Non-Volatile memory controller: Device 1987:5008 (rev 01)
71:00.0 Network controller: Intel Corporation Device 2526 (rev 29)
heartsilence@heartsilence-PC:~$ sudo lshw -C network
[sudo] heartsilence 的密码：
*-network
description: Ethernet interface
product: Qualcomm Atheros
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:02:00.0
logical name: enp2s0
version: 10
serial: 80:fa:5b:5a:96:28
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=alx latency=0 link=no multicast=yes port=twisted pair
resources: irq:16 memory:de600000-de63ffff ioport:d000(size=128)
*-network
description: Ethernet interface
product: Qualcomm Atheros
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:03:00.0
logical name: enp3s0
version: 10
serial: 80:fa:5b:5a:96:29
size: 100Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=alx duplex=full ip=172.16.0.146 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
resources: irq:17 memory:de500000-de53ffff ioport:c000(size=128)
*-network UNCLAIMED
description: Network controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:71:00.0
version: 29
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix cap_list
configuration: latency=0
resources: memory:de200000-de203fff

电脑型号多少？试试输入lsusb。

网卡是这个 当前系统上没有合适的驱动所以用不了

先通过有线网络连上网，在命令行下用以下命令下载编译安装驱动 以后如果升级了内核，内核中还没有更新驱动的话，还需要重装，如果你保留了以前的backport-iwlwifi目录没删，直接运行下面的命令就行了 来源： https://askubuntu.com/a/1028199

感谢，解决了我的问题，特地注册过来回复