在 Dell Vostro 5490 笔记本电脑上，我一直无法让 Wi-fi 正常工作。对于 Ubuntu 19.10 和 Fedora 31，我都遇到了同样的问题。计算机可以连接到互联网，但信号非常弱。我认为这与驱动程序有关，因为在使用 Windows 时，Wi-fi 工作得很好。
我将向您发送命令lspci、lsusb和 的输出sudo iwlist scan && nmcli dev wifi list
编辑1：
lspci 输出
Host bridge: Intel Corporation Device 9b61 (rev 0c)
VGA compatible controller: Intel Corporation UHD Graphics (rev 02)
Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 0c)
System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model
Signal processing controller: Intel Corporation Comet Lake Thermal Subsytem
Serial controller: Intel Corporation Comet Lake Integrated Sensor Solution
USB controller: Intel Corporation Device 02ed
RAM memory: Intel Corporation Device 02ef
Network controller: Intel Corporation Wireless-AC 9462
Serial bus controller [0c80]: Intel Corporation Serial IO I2C Host Controller
Communication controller: Intel Corporation Comet Lake Management Engine Interface
SATA controller: Intel Corporation Comet Lake SATA AHCI Controller
PCI bridge: Intel Corporation Device 02bc (rev f0)
PCI bridge: Intel Corporation Device 02b0 (rev f0)
PCI bridge: Intel Corporation Device 02b4 (rev f0)
ISA bridge: Intel Corporation Device 0284
Multimedia audio controller: Intel Corporation Device 02c8
SMBus: Intel Corporation Device 02a3
Serial bus controller [0c80]: Intel Corporation Comet Lake SPI (flash) Controller
3D controller: NVIDIA Corporation GP108M [GeForce MX250] (rev a1)
Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
Non-Volatile memory controller: Lite-On Technology Corporation Device 9100 (rev 03)
lsusb 输出
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 0bda:5538 Realtek Semiconductor Corp. Integrated_Webcam_HD
Bus 001 Device 002: ID 27c6:538d Shenzhen Goodix Technology Co.,Ltd. FingerPrint
Bus 001 Device 004: ID 8087:0aaa Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
编辑2： sudo iwlist scan && nmcli dev wifi 列表输出
lo Interface doesn't support scanning.
virbr0 Interface doesn't support scanning.
enp2s0 Interface doesn't support scanning.
virbr0-nic Interface doesn't support scanning.
wlp0s20f3 Scan completed :
Cell 01 - Address: 78:BA:F9:E5:F5:8C
Channel:149
Frequency:5.745 GHz
Quality=22/70 Signal level=-88 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s
36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000004997e052f7b
Extra: Last beacon: 17ms ago
IE: Unknown: 0007656475726F616D
IE: Unknown: 01088C129824B048606C
IE: Unknown: 071243412024041134041864051884031895051E
IE: Unknown: 0B050500056E5B
IE: Unknown: 2D1AAC191BFFFFFF0000000000000000000000000000000000000000
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : 802.1x
IE: Unknown: 3D1695000400000000000000000000000000000000000000
IE: Unknown: 7F080010000001400041
IE: Unknown: 851E05008F000F00FF035900773537323541343132000000000000000500004D
IE: Unknown: 9606004096001400
IE: Unknown: BF0CB279830FEAFF0000EAFF0000
IE: Unknown: C005000000C0FF
IE: Unknown: C3020002
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : 802.1x
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
IE: Unknown: DD06004096010104
IE: Unknown: DD050040960305
IE: Unknown: DD050040960B09
IE: Unknown: DD080040961301003401
IE: Unknown: DD050040961405
Cell 02 - Address: 78:BA:F9:E5:F5:83
Channel:11
Frequency:2.462 GHz (Channel 11)
Quality=32/70 Signal level=-78 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
54 Mb/s
Mode:Master
Extra:tsf=000004997da750f1
Extra: Last beacon: 17ms ago
IE: Unknown: 0007656475726F616D
IE: Unknown: 010698243048606C
IE: Unknown: 03010B
IE: Unknown: 0706434120010B1E
IE: Unknown: 0B0501003D8D5B
IE: Unknown: 2A0100
IE: Unknown: 2D1AAC191BFFFFFF0000000000000000000000000000000000000000
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : 802.1x
IE: Unknown: 3D160B000500000000000000000000000000000000000000
IE: Unknown: 7F080010000001400001
IE: Unknown: 851E00008F000F00FF035900773537323541343132000000000000000100004E
IE: Unknown: 9606004096000700
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : 802.1x
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
IE: Unknown: DD06004096010104
IE: Unknown: DD050040960305
IE: Unknown: DD050040960B09
IE: Unknown: DD080040961301003401
IE: Unknown: DD050040961405
Cell 03 - Address: 78:BA:F9:CB:10:23
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=24/70 Signal level=-86 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
54 Mb/s
Mode:Master
Extra:tsf=00000499c46fc966
Extra: Last beacon: 26392ms ago
IE: Unknown: 0007656475726F616D
IE: Unknown: 010698243048606C
IE: Unknown: 030101
IE: Unknown: 0706434120010B1E
IE: Unknown: 0B050400378D5B
IE: Unknown: 2A0100
IE: Unknown: 2D1AAC191BFFFFFF0000000000000000000000000000000000000000
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : 802.1x
IE: Unknown: 3D1601000500000000000000000000000000000000000000
IE: Unknown: 7F080010000001400001
IE: Unknown: 851E04008F000F00FF035900773537323341353136000000000000000400004E
IE: Unknown: 9606004096000700
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : 802.1x
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
IE: Unknown: DD06004096010104
IE: Unknown: DD050040960305
IE: Unknown: DD050040960B09
IE: Unknown: DD080040961301003401
IE: Unknown: DD050040961405
Cell 04 - Address: 78:BA:F9:CB:10:21
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=23/70 Signal level=-87 dBm
Encryption key:on
ESSID:"UdeM avec cryptage"
Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
54 Mb/s
Mode:Master
Extra:tsf=00000499c4706058
Extra: Last beacon: 26392ms ago
IE: Unknown: 00125564654D2061766563206372797074616765
IE: Unknown: 010698243048606C
IE: Unknown: 030101
IE: Unknown: 050400010000
IE: Unknown: 0706434120010B1E
IE: Unknown: 0B050400378D5B
IE: Unknown: 2A0100
IE: Unknown: 2D1AAC191BFFFFFF0000000000000000000000000000000000000000
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : 802.1x
IE: Unknown: 3D1601000500000000000000000000000000000000000000
IE: Unknown: 7F080010000001400001
IE: Unknown: 9606004096000700
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : 802.1x
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
IE: Unknown: DD06004096010104
IE: Unknown: DD050040960305
IE: Unknown: DD050040960B09
IE: Unknown: DD080040961301003401
IE: Unknown: DD050040961405
Cell 05 - Address: 78:BA:F9:E5:F5:80
Channel:11
Frequency:2.462 GHz (Channel 11)
Quality=32/70 Signal level=-78 dBm
Encryption key:off
ESSID:"UdeM non securise"
Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
54 Mb/s
Mode:Master
Extra:tsf=000004997da6d53f
Extra: Last beacon: 17ms ago
IE: Unknown: 00115564654D206E6F6E207365637572697365
IE: Unknown: 010698243048606C
IE: Unknown: 03010B
IE: Unknown: 0706434120010B1E
IE: Unknown: 0B0501003D8D5B
IE: Unknown: 2A0100
IE: Unknown: 2D1AAC191BFFFFFF0000000000000000000000000000000000000000
IE: Unknown: 3D160B000500000000000000000000000000000000000000
IE: Unknown: 7F080010000001400001
IE: Unknown: 851E00008F000F00FF035900773537323541343132000000000000000100004E
IE: Unknown: 9606004096000700
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
IE: Unknown: DD06004096010104
IE: Unknown: DD050040960305
IE: Unknown: DD050040960B09
IE: Unknown: DD080040961301003401
IE: Unknown: DD050040961404
Cell 06 - Address: 78:BA:F9:E5:F5:81
Channel:11
Frequency:2.462 GHz (Channel 11)
Quality=32/70 Signal level=-78 dBm
Encryption key:on
ESSID:"UdeM avec cryptage"
Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
54 Mb/s
Mode:Master
Extra:tsf=000004997da61776
Extra: Last beacon: 17ms ago
IE: Unknown: 00125564654D2061766563206372797074616765
IE: Unknown: 010698243048606C
IE: Unknown: 03010B
IE: Unknown: 0706434120010B1E
IE: Unknown: 0B0501003D8D5B
IE: Unknown: 2A0100
IE: Unknown: 2D1AAC191BFFFFFF0000000000000000000000000000000000000000
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : 802.1x
IE: Unknown: 3D160B000500000000000000000000000000000000000000
IE: Unknown: 7F080010000001400001
IE: Unknown: 9606004096000700
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : 802.1x
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
IE: Unknown: DD06004096010104
IE: Unknown: DD050040960305
IE: Unknown: DD050040960B09
IE: Unknown: DD080040961301003401
IE: Unknown: DD050040961405
Cell 07 - Address: 78:BA:F9:E5:F5:8F
Channel:149
Frequency:5.745 GHz
Quality=25/70 Signal level=-85 dBm
Encryption key:off
ESSID:"UdeM non securise"
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s
36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000004997e064b3b
Extra: Last beacon: 17ms ago
IE: Unknown: 00115564654D206E6F6E207365637572697365
IE: Unknown: 01088C129824B048606C
IE: Unknown: 071243412024041134041864051884031895051E
IE: Unknown: 0B050500056E5B
IE: Unknown: 2D1AAC191BFFFFFF0000000000000000000000000000000000000000
IE: Unknown: 3D1695000400000000000000000000000000000000000000
IE: Unknown: 7F080010000001400041
IE: Unknown: 851E05008F000F00FF035900773537323541343132000000000000000500004D
IE: Unknown: 9606004096001400
IE: Unknown: BF0CB279830FEAFF0000EAFF0000
IE: Unknown: C005000000C0FF
IE: Unknown: C3020002
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
IE: Unknown: DD06004096010104
IE: Unknown: DD050040960305
IE: Unknown: DD050040960B09
IE: Unknown: DD080040961301003401
IE: Unknown: DD050040961404
Cell 08 - Address: 78:BA:F9:E5:F5:8E
Channel:149
Frequency:5.745 GHz
Quality=24/70 Signal level=-86 dBm
Encryption key:on
ESSID:"UdeM avec cryptage"
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s
36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000004997e058d5c
Extra: Last beacon: 17ms ago
IE: Unknown: 00125564654D2061766563206372797074616765
IE: Unknown: 01088C129824B048606C
IE: Unknown: 071243412024041134041864051884031895051E
IE: Unknown: 0B050500056E5B
IE: Unknown: 2D1AAC191BFFFFFF0000000000000000000000000000000000000000
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : 802.1x
IE: Unknown: 3D1695000400000000000000000000000000000000000000
IE: Unknown: 7F080010000001400041
IE: Unknown: 9606004096001400
IE: Unknown: BF0CB279830FEAFF0000EAFF0000
IE: Unknown: C005000000C0FF
IE: Unknown: C3020002
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : 802.1x
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
IE: Unknown: DD06004096010104
IE: Unknown: DD050040960305
IE: Unknown: DD050040960B09
IE: Unknown: DD080040961301003401
IE: Unknown: DD050040961405
提前致谢。