右上角的 WiFi 符号是空的，没有出现 WiFi 网络，我尝试设置一个，但“设备”框呈灰色。我有 Ubuntu 16.04。当我输入命令时，lswh -C network我得到以下信息：
*-network UNCLAIMED
description: Network controller
product: BCM43142 802.11b/g/n
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:03:00.0
version: 01
width: 64 bits
clock: 33Mhz
capabilities: cap_list
configuration: latency=0
resources: memory:94100000-94107fff
*-network
description: Ethernet interface
product: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info pci@0000:04:00.0
logical name: eno1
version: 0a
serial: dc:4a:3e:f7:23:64
size: 10Mbit/s
capacity: 100Mbiy/s
width: 64 bits
clock: 33Mhz
capabilities: bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8107e-2_0.02 02/26/15 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:129 ioport:3000(size=256) memory:94004000-94004fff memory:94000000-94003fff
并警告不要以超级用户身份运行此程序
如果我使用以太网电缆，或者我在 Windows 10 中启动笔记本电脑，我就可以访问互联网
答案1
你可能缺少 WiFi 驱动程序。打开终端并输入：
sudo apt-get update
sudo apt-get install bcmwl-kernel-source
编辑
在 BIOS 中禁用安全启动也是驱动程序正常运行的必要条件