我在戴尔 Inspiron 上使用 Ubuntu 18.04。更新后，我发现没有安装 WiFi 适配器。我尝试通过运行这个脚本我在 GitHub 上找到了。
#!/bin/bash
printf "
Powered by:
___ _ ___ _
| _ \(_) __ | __|(_)__ __
| /| |/ _|| _| | |\ \ /
|_|_\|_|\__||_| |_|/_\_\
"
echo""
sudo cd /tmp/
sudo wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.1/linux-headers-5.1.0-050100_5.1.0-050100.201905052130_all.deb
sudo wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.1/linux-headers-5.1.0-050100-generic_5.1.0-050100.201905052130_amd64.deb
sudo wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.1/linux-image-unsigned-5.1.0-050100-generic_5.1.0-050100.201905052130_amd64.deb
sudo wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.1/linux-modules-5.1.0-050100-generic_5.1.0-050100.201905052130_amd64.deb
sudo dpkg -i *.deb
#Wifi drive install
sudo wget https://wireless.wiki.kernel.org/_media/en/users/drivers/iwlwifi/iwlwifi-cc-46.3cfab8da.0.tgz
sudo tar -xzvf iwlwifi-cc-46.3cfab8da.0.tgz
sudo cp iwlwifi-cc-46.3cfab8da.0/iwlwifi-cc-a0-46.ucode /lib/firmware/
echo "Please Reboot your pc"
~
重新启动后（按照脚本执行后提示操作），有线连接标志也从任务栏中消失了。我打开了系统设置/网络连接，得到了以下信息：
看来我确实有连接，但仍然没有有效的互联网连接！！！
无线脚本的输出：
########## wireless info START ##########
Report from: 10 Nov 2019 13:57 EET +0200
Booted last: 10 Nov 2019 00:00 EET +0200
Script from: 22 Oct 2018 03:34 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 18.04.3 LTS
Release: 18.04
Codename: bionic
##### kernel ############################
Linux 5.1.0-050100-generic #201905052130 SMP Mon May 6 01:32:59 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=1
##### desktop ###########################
Unity
##### lspci #############################
06:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM43142 802.11b/g/n [14e4:4365] (rev 01)
Subsystem: Dell Wireless 1704 802.11n + BT 4.0 [1028:0016]
Kernel driver in use: bcma-pci-bridge
07:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL810xE PCI Express Fast Ethernet controller [10ec:8136] (rev 07)
Subsystem: Dell RTL810xE PCI Express Fast Ethernet controller [1028:0655]
Kernel driver in use: r8169
##### lsusb #############################
Bus 001 Device 007: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 006: ID 0a5c:21d7 Broadcom Corp. BCM43142 Bluetooth 4.0
Bus 001 Device 004: ID 0c45:670b Microdia
Bus 001 Device 005: ID 045e:0084 Microsoft Corp. Basic Optical Mouse
Bus 001 Device 009: ID 0930:6545 Toshiba Corp. Kingston DataTraveler 102/2.0 / HEMA Flash Drive 2 GB / PNY Attache 4GB Stick
Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 002: ID 8087:8001 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 002: ID 03f0:e111 Hewlett-Packard
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info ##################
##### rfkill ############################
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
##### secure boot #######################
'mokutil' is not installed (package "mokutil").
##### lsmod #############################
dell_laptop 20480 0
ledtrig_audio 16384 3 snd_hda_codec_generic,snd_hda_codec_realtek,dell_laptop
dell_wmi 20480 0
dell_smbios 28672 2 dell_wmi,dell_laptop
dell_wmi_descriptor 20480 2 dell_wmi,dell_smbios
sparse_keymap 16384 1 dell_wmi
mxm_wmi 16384 1 nouveau
wmi_bmof 16384 0
bcma 61440 0
wmi 32768 6 dell_wmi,wmi_bmof,dell_smbios,dell_wmi_descriptor,mxm_wmi,nouveau
video 45056 4 dell_wmi,dell_laptop,i915,nouveau
##### interfaces ########################
[/etc/network/interfaces]
auto lo
iface lo inet loopback
##### ifconfig ##########################
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback <MAC address> brd <MAC address>
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp7s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether <MAC 'enp7s0' [IF1]> brd <MAC address>
inet 192.168.1.2/24 brd 192.168.1.255 scope global dynamic enp7s0
valid_lft 84452sec preferred_lft 84452sec
inet6 2a02:2149:8419:a900:48c4:2602:bb11:a9e2/64 scope global temporary dynamic
valid_lft 86354sec preferred_lft 43154sec
inet6 2a02:2149:8419:a900:929a:f7a2:5cd3:f74f/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 86354sec preferred_lft 43154sec
inet6 fe80::b2aa:4781:308f:8281/64 scope link
valid_lft forever preferred_lft forever
##### iwconfig ##########################
enp7s0 no wireless extensions.
lo no wireless extensions.
##### route #############################
default via 192.168.1.1 dev enp7s0 proto static metric 100
192.168.1.0/24 dev enp7s0 proto kernel scope link src 192.168.1.2 metric 100
##### resolv.conf #######################
[777 root '/etc/resolv.conf' -> '../run/systemd/resolve/stub-resolv.conf']
nameserver 127.0.0.53
options edns0
##### network managers ##################
Installed:
None found.
Running:
root 1159 1 0 13:24 ? 00:00:00 /snap/network-manager/379/usr/sbin/NetworkManager --config-dir=/var/snap/network-manager/379/conf.d/ --config=/snap/network-manager/379/etc/NetworkManager/NetworkManager.conf --log-level=INFO --no-daemon
##### NetworkManager info ###############
NetworkManager is not installed (package "network-manager").
##### NetworkManager.state ##############
cat: /var/lib/NetworkManager/NetworkManager.state: No such file or directory
##### NetworkManager config #############
[[/usr/lib/NetworkManager/conf.d/no-mac-addr-change.conf]]
[device-mac-addr-change-wifi]
match-device=driver:rtl8723bs,driver:rtl8189es,driver:r8188eu,driver:8188eu,driver:eagle_sdio,driver:wl
wifi.scan-rand-mac-address=no
wifi.cloned-mac-address=preserve
ethernet.cloned-mac-address=preserve
##### NetworkManager profiles ###########
##### Netplan config ####################
[/etc/netplan/01-network-manager-all.yaml]
network:
version: 2
renderer: NetworkManager
##### iw reg get ########################
Region: Europe/Athens (based on set time zone)
global
country 00: DFS-UNSET
(2402 - 2472 @ 40), (6, 20), (N/A)
(2457 - 2482 @ 20), (6, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(2474 - 2494 @ 20), (6, 20), (N/A), NO-OFDM, PASSIVE-SCAN
(5170 - 5250 @ 80), (6, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(5250 - 5330 @ 80), (6, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN
(5490 - 5730 @ 160), (6, 20), (0 ms), DFS, PASSIVE-SCAN
(5735 - 5835 @ 80), (6, 20), (N/A), PASSIVE-SCAN
(57240 - 63720 @ 2160), (N/A, 0), (N/A)
##### iwlist channels ###################
enp7s0 no frequency information.
lo no frequency information.
##### iwlist scan #######################
enp7s0 Interface doesn't support scanning.
lo Interface doesn't support scanning.
##### module infos ######################
[bcma]
filename: /lib/modules/5.1.0-050100-generic/kernel/drivers/bcma/bcma.ko
license: GPL
description: Broadcom's specific AMBA driver
srcversion: 9FF0F781F456EC613F149E3
depends:
retpoline: Y
intree: Y
name: bcma
vermagic: 5.1.0-050100-generic SMP mod_unload
signat: PKCS#7
signer:
sig_key:
sig_hashalgo: md4
##### module parameters #################
##### /etc/modules ######################
##### modprobe options ##################
[/etc/modprobe.d/amd64-microcode-blacklist.conf]
blacklist microcode
[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci
[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist i2c_i801
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac
[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off
[/etc/modprobe.d/intel-microcode-blacklist.conf]
blacklist microcode
[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211
##### rc.local ##########################
grep: /etc/rc.local: No such file or directory
##### pm-utils ##########################
##### udev rules ########################
[/etc/udev/rules.d/70-snap.network-manager.rules]
# network-manager
KERNEL=="rfkill", TAG+="snap_network-manager_networkmanager"
# ppp
KERNEL=="ppp", TAG+="snap_network-manager_networkmanager"
# ppp
KERNEL=="tty[a-zA-Z]*[0-9]*", TAG+="snap_network-manager_networkmanager"
TAG=="snap_network-manager_networkmanager", RUN+="/usr/lib/snapd/snap-device-helper $env{ACTION} snap_network-manager_networkmanager $devpath $major:$minor"
##### dmesg #############################
[ 63.488988] r8169 0000:07:00.0 enp7s0: Link is Down
[ 65.245800] r8169 0000:07:00.0 enp7s0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 65.245810] IPv6: ADDRCONF(NETDEV_CHANGE): enp7s0: link becomes ready
########## wireless info END ############
答案1
我遇到了同样的问题。试试这个：
在 UEFI（BIOS）设置中禁用安全启动
重新安装 Linux 固件
sudo apt install linux-firmware在 grub 中添加参数 pcie_aspm=off ：
sudo gedit /etc/default/grub添加
pcie_aspm=off到GRUB_CMDLINE_LINUX_DEFAULT重启
它对我有用，祝你好运！
答案2
1- 转到“软件和更新”，然后转到“其他驱动程序”选项卡。在该选项卡中，选择 WiFi 适配器的驱动程序。最后，应用更改。
2- 听到提示后，您需要更新驱动程序。您可以通过 GUI 进行更新，但最好的方法是使用命令行：
sudo apt update
sudo apt --reinstall install bcmwl-kernel-source
3- 最后，您必须从 BIOS 禁用安全启动。具体方法取决于您的笔记本电脑/个人电脑。通常，F2 或 F3 可让您访问 BIOS 设置，然后您必须在那里搜索安全启动选项并将其禁用。
4-重新启动并（希望）享受。