升级到 Ubuntu 20.04 后，我的互联网连接出现了问题。
目前的情况如下：
如果我将电脑连接到主 wifi（我所有其他设备都连接到该 wifi），我很少能连接上。连接不稳定、速度慢，而且几乎无法连接。
如果我连接到中继器，我会获得稍微好一点的连接。
如果在我的智能手机上创建一个热点并将我的电脑连接到它，我就能获得良好的连接。
我所有其他设备都毫无问题地连接到主路由器（智能手机、电视、其他笔记本电脑）。只有一台笔记本电脑我无法连接，它是装有 Ubuntu LTS 20.04 的那台。请注意，我能够毫无问题地从 18.04 版本升级到互联网。
我读了几篇关于我认为是类似问题的帖子，但都不起作用。也许解决方案是重新安装 Ubuntu？
########## wireless info START ##########
Report from: 24 Feb 2021 09:13 EST -0500
Booted last: 24 Feb 2021 00:00 EST -0500
Script from: 25 Jan 2020 03:34 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 20.04.2 LTS
Release: 20.04
Codename: focal
##### kernel ############################
Linux 5.4.0-65-generic #73-Ubuntu SMP Mon Jan 18 17:25:17 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
Ubuntu
##### lspci #############################
libkmod: ERROR ../libkmod/libkmod-config.c:656 kmod_config_parse: /etc/modprobe.d/rtl8723be.conf line 2: ignoring bad line starting with 'exit'
libkmod: ERROR ../libkmod/libkmod-config.c:656 kmod_config_parse: /etc/modprobe.d/rtl8723be.conf line 3: ignoring bad line starting with 'ls'
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
DeviceName: Foxconn WLAN Realtek Sanji RTL8723BE bgn 1x1 + BT 4 LE PCIe+USB NGFF 2230 M.2 WW
Subsystem: Hewlett-Packard Company RTL8723BE PCIe Wireless Network Adapter [103c:804c]
##### lsusb #############################
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 0bda:b006 Realtek Semiconductor Corp. Bluetooth Radio
Bus 001 Device 003: ID 04f2:b50d Chicony Electronics Co., Ltd HP Truevision HD
Bus 001 Device 005: ID 0bc2:3300 Seagate RSS LLC Desktop
Bus 001 Device 006: ID 058f:6387 Alcor Micro Corp. Flash Drive
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info ##################
##### rfkill ############################
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
##### secure boot #######################
SecureBoot disabled
##### lsmod #############################
rtl8723be 102400 0
btcoexist 155648 1 rtl8723be
rtl8723_common 24576 1 rtl8723be
rtl_pci 28672 1 rtl8723be
rtlwifi 90112 4 rtl_pci,rtl8723be,btcoexist,rtl8723_common
mac80211 843776 3 rtl_pci,rtl8723be,rtlwifi
hp_wmi 16384 0
sparse_keymap 16384 1 hp_wmi
wmi_bmof 16384 0
cfg80211 704512 2 rtlwifi,mac80211
libarc4 16384 1 mac80211
wmi 32768 2 hp_wmi,wmi_bmof
##### 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: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether <MAC 'wlan0' [IF1]> brd <MAC address>
inet 192.168.0.15/24 brd 192.168.0.255 scope global dynamic noprefixroute wlan0
valid_lft 42777sec preferred_lft 42777sec
inet6 fe80::99be:f67c:eb4c:b04e/64 scope link noprefixroute
valid_lft forever preferred_lft forever
##### iwconfig ##########################
lo no wireless extensions.
wlan0 IEEE 802.11 ESSID:"0017508204"
Mode:Managed Frequency:2.462 GHz Access Point: <MAC '0017508204' [AC1]>
Bit Rate=72.2 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
Link Quality=48/70 Signal level=-62 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:1133 Missed beacon:0
##### route #############################
default via 192.168.0.1 dev wlan0 proto dhcp metric 600
169.254.0.0/16 dev wlan0 scope link metric 1000
192.168.0.0/24 dev wlan0 proto kernel scope link src 192.168.0.15 metric 600
##### resolv.conf #######################
[644 root '/etc/resolv.conf']
nameserver 127.0.0.53
##### network managers ##################
Installed:
NetworkManager
Running:
root 609 1 0 08:22 ? 00:00:04 /usr/sbin/NetworkManager --no-daemon
##### NetworkManager info ###############
GENERAL.DEVICE: wlan0
GENERAL.TYPE: wifi
GENERAL.NM-TYPE: NMDeviceWifi
GENERAL.DBUS-PATH: /org/freedesktop/NetworkManager/Devices/2
GENERAL.VENDOR: Realtek Semiconductor Co., Ltd.
GENERAL.PRODUCT: RTL8723BE PCIe Wireless Network Adapter
GENERAL.DRIVER: rtl8723be
GENERAL.DRIVER-VERSION: 5.4.0-65-generic
GENERAL.FIRMWARE-VERSION: N/A
GENERAL.HWADDR: <MAC 'wlan0' [IF1]>
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.REASON: 0 (No reason given)
GENERAL.IP4-CONNECTIVITY: 4 (full)
GENERAL.IP6-CONNECTIVITY: 3 (limited)
GENERAL.UDI: /sys/devices/pci0000:00/0000:00:1c.3/0000:02:00.0/net/wlan0
GENERAL.IP-IFACE: wlan0
GENERAL.IS-SOFTWARE: no
GENERAL.NM-MANAGED: yes
GENERAL.AUTOCONNECT: yes
GENERAL.FIRMWARE-MISSING: no
GENERAL.NM-PLUGIN-MISSING: no
GENERAL.PHYS-PORT-ID: --
GENERAL.CONNECTION: 0017508204
GENERAL.CON-UUID: f493740d-38bd-494f-8d61-562e1aef0549
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/6
GENERAL.METERED: no (guessed)
CAPABILITIES.CARRIER-DETECT: no
CAPABILITIES.SPEED: 72 Mb/s
CAPABILITIES.IS-SOFTWARE: no
CAPABILITIES.SRIOV: no
INTERFACE-FLAGS.UP: yes
INTERFACE-FLAGS.LOWER-UP: yes
INTERFACE-FLAGS.CARRIER: yes
WIFI-PROPERTIES.WEP: yes
WIFI-PROPERTIES.WPA: yes
WIFI-PROPERTIES.WPA2: yes
WIFI-PROPERTIES.TKIP: yes
WIFI-PROPERTIES.CCMP: yes
WIFI-PROPERTIES.AP: yes
WIFI-PROPERTIES.ADHOC: yes
WIFI-PROPERTIES.2GHZ: yes
WIFI-PROPERTIES.5GHZ: no
WIFI-PROPERTIES.MESH: yes
WIFI-PROPERTIES.IBSS-RSN: yes
IP4.ADDRESS[1]: 192.168.0.15/24
IP4.GATEWAY: 192.168.0.1
IP4.ROUTE[1]: dst = 0.0.0.0/0, nh = 192.168.0.1, mt = 600
IP4.ROUTE[2]: dst = 192.168.0.0/24, nh = 0.0.0.0, mt = 600
IP4.ROUTE[3]: dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.DNS[1]: 24.154.1.68
IP4.DNS[2]: 24.154.1.34
DHCP4.OPTION[1]: dhcp_lease_time = 43200
DHCP4.OPTION[2]: domain_name_servers = 24.154.1.68 24.154.1.34
DHCP4.OPTION[3]: expiry = 1614218793
DHCP4.OPTION[4]: host_name = nuno-HP-Stream-Notebook
DHCP4.OPTION[5]: ip_address = 192.168.0.15
DHCP4.OPTION[6]: next_server = 192.168.0.1
DHCP4.OPTION[7]: requested_broadcast_address = 1
DHCP4.OPTION[8]: requested_domain_name = 1
DHCP4.OPTION[9]: requested_domain_name_servers = 1
DHCP4.OPTION[10]: requested_domain_search = 1
DHCP4.OPTION[11]: requested_host_name = 1
DHCP4.OPTION[12]: requested_interface_mtu = 1
DHCP4.OPTION[13]: requested_ms_classless_static_routes = 1
DHCP4.OPTION[14]: requested_nis_domain = 1
DHCP4.OPTION[15]: requested_nis_servers = 1
DHCP4.OPTION[16]: requested_ntp_servers = 1
DHCP4.OPTION[17]: requested_rfc3442_classless_static_routes = 1
DHCP4.OPTION[18]: requested_root_path = 1
DHCP4.OPTION[19]: requested_routers = 1
DHCP4.OPTION[20]: requested_static_routes = 1
DHCP4.OPTION[21]: requested_subnet_mask = 1
DHCP4.OPTION[22]: requested_time_offset = 1
DHCP4.OPTION[23]: requested_wpad = 1
DHCP4.OPTION[24]: routers = 192.168.0.1
DHCP4.OPTION[25]: subnet_mask = 255.255.255.0
IP6.ADDRESS[1]: fe80::99be:f67c:eb4c:b04e/64
IP6.GATEWAY: --
IP6.ROUTE[1]: dst = fe80::/64, nh = ::, mt = 600
IP6.ROUTE[2]: dst = ff00::/8, nh = ::, mt = 256, table=255
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: /org/freedesktop/NetworkManager/Settings/6
CONNECTIONS.AVAILABLE-CONNECTIONS[1]: f493740d-38bd-494f-8d61-562e1aef0549 | 0017508204
GENERAL.DEVICE: <MAC address>
GENERAL.TYPE: bt
GENERAL.NM-TYPE: NMDeviceBt
GENERAL.DBUS-PATH: /org/freedesktop/NetworkManager/Devices/3
GENERAL.VENDOR: --
GENERAL.PRODUCT: --
GENERAL.DRIVER: bluez
GENERAL.DRIVER-VERSION: --
GENERAL.FIRMWARE-VERSION: --
GENERAL.HWADDR: <MAC address>
GENERAL.MTU: 1500
GENERAL.STATE: 30 (disconnected)
GENERAL.REASON: 0 (No reason given)
GENERAL.IP4-CONNECTIVITY: 1 (none)
GENERAL.IP6-CONNECTIVITY: 1 (none)
GENERAL.UDI: /org/bluez/hci0/dev_E8_36_17_05_F6_EB
GENERAL.IP-IFACE: --
GENERAL.IS-SOFTWARE: no
GENERAL.NM-MANAGED: yes
GENERAL.AUTOCONNECT: yes
GENERAL.FIRMWARE-MISSING: no
GENERAL.NM-PLUGIN-MISSING: no
GENERAL.PHYS-PORT-ID: --
GENERAL.CONNECTION: --
GENERAL.CON-UUID: --
GENERAL.CON-PATH: --
GENERAL.METERED: unknown
CAPABILITIES.CARRIER-DETECT: no
CAPABILITIES.SPEED: unknown
CAPABILITIES.IS-SOFTWARE: no
CAPABILITIES.SRIOV: no
INTERFACE-FLAGS.UP: no
INTERFACE-FLAGS.LOWER-UP: no
INTERFACE-FLAGS.CARRIER: no
BLUETOOTH.CAPABILITIES: NAP
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: /org/freedesktop/NetworkManager/Settings/10
CONNECTIONS.AVAILABLE-CONNECTIONS[1]: d85336bd-a5de-4c5f-8386-7ac0611fd5eb | iPhone Network
GENERAL.DEVICE: p2p-dev-wlan0
GENERAL.TYPE: wifi-p2p
GENERAL.NM-TYPE: NMDeviceWifiP2P
GENERAL.DBUS-PATH: /org/freedesktop/NetworkManager/Devices/4
GENERAL.VENDOR: --
GENERAL.PRODUCT: --
GENERAL.DRIVER: (unknown)
GENERAL.DRIVER-VERSION: --
GENERAL.FIRMWARE-VERSION: --
GENERAL.HWADDR: (unknown)
GENERAL.MTU: 0
GENERAL.STATE: 30 (disconnected)
GENERAL.REASON: 0 (No reason given)
GENERAL.IP4-CONNECTIVITY: 1 (none)
GENERAL.IP6-CONNECTIVITY: 1 (none)
GENERAL.UDI: /virtual/device/placeholder/1
GENERAL.IP-IFACE: --
GENERAL.IS-SOFTWARE: no
GENERAL.NM-MANAGED: yes
GENERAL.AUTOCONNECT: yes
GENERAL.FIRMWARE-MISSING: no
GENERAL.NM-PLUGIN-MISSING: no
GENERAL.PHYS-PORT-ID: --
GENERAL.CONNECTION: --
GENERAL.CON-UUID: --
GENERAL.CON-PATH: --
GENERAL.METERED: unknown
CAPABILITIES.CARRIER-DETECT: no
CAPABILITIES.SPEED: unknown
CAPABILITIES.IS-SOFTWARE: no
CAPABILITIES.SRIOV: no
INTERFACE-FLAGS.UP: no
INTERFACE-FLAGS.LOWER-UP: no
INTERFACE-FLAGS.CARRIER: no
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: --
SSID BSSID MODE CHAN FREQ RATE SIGNAL BARS SECURITY ACTIVE IN-USE
0017508204 <MAC '0017508204' [AC1]> Infra 11 2462 MHz 195 Mbit/s 64 â–‚â–„â–†_ WPA1 WPA2 yes *
-- <MAC '' [AC2]> Infra 11 2462 MHz 65 Mbit/s 40 â–‚â–„__ -- no
##### NetworkManager.state ##############
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
##### NetworkManager config #############
[[/etc/NetworkManager/conf.d/default-wifi-powersave-on.conf]]
[connection]
wifi.powersave = 2
[[/etc/NetworkManager/NetworkManager.conf]]
[main]
plugins=ifupdown,keyfile
[ifupdown]
managed=false
[device]
wifi.scan-rand-mac-address=no
[[/usr/lib/NetworkManager/conf.d/10-dns-resolved.conf]]
[main]
dns=systemd-resolved
[[/usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf]]
[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma
[[/usr/lib/NetworkManager/conf.d/20-connectivity-ubuntu.conf]]
[connectivity]
uri=http://connectivity-check.ubuntu.com/
[[/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
##### NetworkManager profiles ###########
[[/etc/NetworkManager/system-connections/Panera]] (600 root)
[connection] id=Panera | type=802-11-wireless
[802-11-wireless] ssid=Panera | mac-address=<MAC 'wlan0' [IF1]>
[ipv6] method=auto
[ipv4] method=auto
[[/etc/NetworkManager/system-connections/iPhone.nmconnection]] (600 root)
[connection] id=iPhone | type=wifi | permissions=
[wifi] mac-address-blacklist= | ssid=iPhone
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/TP-LINK_Extender_568017]] (600 root)
[connection] id=TP-LINK_Extender_568017 | type=wifi | permissions=user:nuno:;
[wifi] mac-address=<MAC 'wlan0' [IF1]> | mac-address-blacklist= | ssid=TP-LINK_Extender_568017
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/WLAN_2E8C]] (600 root)
[connection] id=WLAN_2E8C | type=wifi | permissions=user:nuno:;
[wifi] mac-address=<MAC 'wlan0' [IF1]> | mac-address-blacklist= | ssid=WLAN_2E8C
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/MOVISTAR_3D28]] (600 root)
[connection] id=MOVISTAR_3D28 | type=wifi | permissions=
[wifi] mac-address=<MAC 'wlan0' [IF1]> | mac-address-blacklist= | ssid=MOVISTAR_3D28
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/Thomson048FE5]] (600 root)
[connection] id=Thomson048FE5 | type=wifi | permissions=
[wifi] mac-address=<MAC 'wlan0' [IF1]> | mac-address-blacklist= | ssid=Thomson048FE5
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/0017508204.nmconnection]] (600 root)
[connection] id=0017508204 | type=wifi | permissions=
[wifi] mac-address-blacklist= | ssid=0017508204
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/CATZNET2G]] (600 root)
[connection] id=CATZNET2G | type=wifi | permissions=user:nuno:;
[wifi] mac-address=<MAC 'wlan0' [IF1]> | mac-address-blacklist= | ssid=CATZNET2G
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/SRU-Guest]] (600 root)
[connection] id=SRU-Guest | type=wifi | permissions=user:nuno:;
[wifi] mac-address=<MAC 'wlan0' [IF1]> | mac-address-blacklist= | ssid=SRU-Guest
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/ANNE]] (600 root)
[connection] id=ANNE | type=wifi | permissions=user:nuno:;
[wifi] mac-address=<MAC 'wlan0' [IF1]> | mac-address-blacklist= | ssid=ANNE
[ipv4] method=auto
[ipv6] method=auto
##### Netplan config ####################
##### iw reg get ########################
Region: America/New_York (based on set time zone)
global
country US: DFS-FCC
(2400 - 2472 @ 40), (N/A, 30), (N/A)
(5150 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
(5250 - 5350 @ 80), (N/A, 23), (0 ms), DFS, AUTO-BW
(5470 - 5730 @ 160), (N/A, 23), (0 ms), DFS
(5730 - 5850 @ 80), (N/A, 30), (N/A)
(57240 - 71000 @ 2160), (N/A, 40), (N/A)
##### iwlist channels ###################
lo no frequency information.
wlan0 11 channels in total; available frequencies :
Channel 01 : 2.412 GHz
Channel 02 : 2.417 GHz
Channel 03 : 2.422 GHz
Channel 04 : 2.427 GHz
Channel 05 : 2.432 GHz
Channel 06 : 2.437 GHz
Channel 07 : 2.442 GHz
Channel 08 : 2.447 GHz
Channel 09 : 2.452 GHz
Channel 10 : 2.457 GHz
Channel 11 : 2.462 GHz
Current Frequency:2.462 GHz (Channel 11)
##### iwlist scan #######################
lo Interface doesn't support scanning.
Channel occupancy:
2 APs on Frequency:2.462 GHz (Channel 11)
wlan0 Scan completed :
Cell 01 - Address: <MAC '0017508204' [AC1]>
Channel:11
Frequency:2.462 GHz (Channel 11)
Quality=48/70 Signal level=-62 dBm
Encryption key:on
ESSID:"0017508204"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=0000026fc3935180
Extra: Last beacon: 128ms ago
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
Cell 02 - Address: <MAC '' [AC2]>
Channel:11
Frequency:2.462 GHz (Channel 11)
Quality=30/70 Signal level=-80 dBm
Encryption key:off
ESSID:""
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=0000026fc391c142
Extra: Last beacon: 256ms ago
##### module infos ######################
[rtl8723be]
filename: /lib/modules/5.4.0-65-generic/kernel/drivers/net/wireless/realtek/rtlwifi/rtl8723be/rtl8723be.ko
description: Realtek 8723BE 802.11n PCI wireless
license: GPL
depends: rtlwifi,rtl8723-common,rtl_pci,btcoexist,mac80211
retpoline: Y
intree: Y
name: rtl8723be
vermagic: 5.4.0-65-generic SMP mod_unload
parm: swenc:Set to 1 for software crypto (default 0)
parm: ips:Set to 0 to not use link power save (default 1)
parm: swlps:Set to 1 to use SW control power save (default 0)
parm: fwlps:Set to 1 to use FW control power save (default 1)
parm: msi:Set to 1 to use MSI interrupts mode (default 0)
parm: aspm:Set to 1 to enable ASPM (default 1)
parm: debug_level:Set debug level (0-5) (default 0) (int)
parm: debug_mask:Set debug mask (default 0) (ullong)
parm: disable_watchdog:Set to 1 to disable the watchdog (default 0)
parm: ant_sel:Set to 1 or 2 to force antenna number (default 0)
[rtl8723_common]
filename: /lib/modules/5.4.0-65-generic/kernel/drivers/net/wireless/realtek/rtlwifi/rtl8723com/rtl8723-common.ko
description: Realtek RTL8723AE/RTL8723BE 802.11n PCI wireless common routines
license: GPL
depends: rtlwifi
retpoline: Y
intree: Y
name: rtl8723_common
vermagic: 5.4.0-65-generic SMP mod_unload
[rtl_pci]
filename: /lib/modules/5.4.0-65-generic/kernel/drivers/net/wireless/realtek/rtlwifi/rtl_pci.ko
description: PCI basic driver for rtlwifi
license: GPL
depends: mac80211,rtlwifi
retpoline: Y
intree: Y
name: rtl_pci
vermagic: 5.4.0-65-generic SMP mod_unload
[rtlwifi]
filename: /lib/modules/5.4.0-65-generic/kernel/drivers/net/wireless/realtek/rtlwifi/rtlwifi.ko
description: Realtek 802.11n PCI wireless core
license: GPL
depends: mac80211,cfg80211
retpoline: Y
intree: Y
name: rtlwifi
vermagic: 5.4.0-65-generic SMP mod_unload
[mac80211]
filename: /lib/modules/5.4.0-65-generic/kernel/net/mac80211/mac80211.ko
license: GPL
description: IEEE 802.11 subsystem
depends: cfg80211,libarc4
retpoline: Y
intree: Y
name: mac80211
vermagic: 5.4.0-65-generic SMP mod_unload
parm: minstrel_vht_only:Use only VHT rates when VHT is supported by sta. (bool)
parm: max_nullfunc_tries:Maximum nullfunc tx tries before disconnecting (reason 4). (int)
parm: max_probe_tries:Maximum probe tries before disconnecting (reason 4). (int)
parm: beacon_loss_count:Number of beacon intervals before we decide beacon was lost. (int)
parm: probe_wait_ms:Maximum time(ms) to wait for probe response before disconnecting (reason 4). (int)
parm: ieee80211_default_rc_algo:Default rate control algorithm for mac80211 to use (charp)
[cfg80211]
filename: /lib/modules/5.4.0-65-generic/kernel/net/wireless/cfg80211.ko
description: wireless configuration support
license: GPL
depends:
retpoline: Y
intree: Y
name: cfg80211
vermagic: 5.4.0-65-generic SMP mod_unload
parm: bss_entries_limit:limit to number of scan BSS entries (per wiphy, default 1000) (int)
parm: ieee80211_regdom:IEEE 802.11 regulatory domain code (charp)
parm: cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)
##### module parameters #################
[rtl8723be]
ant_sel: 0
aspm: 1
debug_level: 0
debug_mask: 0
disable_watchdog: N
fwlps: Y
ips: Y
msi: N
swenc: N
swlps: N
[mac80211]
beacon_loss_count: 7
ieee80211_default_rc_algo: minstrel_ht
max_nullfunc_tries: 2
max_probe_tries: 5
minstrel_vht_only: Y
probe_wait_ms: 500
[cfg80211]
bss_entries_limit: 1000
cfg80211_disable_40mhz_24ghz: N
ieee80211_regdom: 00
##### /etc/modules ######################
lp
##### 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 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
[/etc/modprobe.d/rtl8723be.conf]
exit
ls
##### rc.local ##########################
grep: /etc/rc.local: No such file or directory
##### pm-utils ##########################
[/etc/pm/sleep.d/config] (644 root)
SUSPEND_MODULES= "RTL8723"
##### udev rules ########################
[/etc/udev/rules.d/70-persistent-net.rules]
# PCI device 0x10ec:0xb723 (rtl8723be)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC 'wlan0' [IF1]>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"
##### dmesg #############################
[ 17.711737] wlan0: authenticate with <MAC '0017508204' [AC1]>
[ 17.729467] wlan0: send auth to <MAC '0017508204' [AC1]> (try 1/3)
[ 17.732002] wlan0: authenticated
[ 17.738312] wlan0: associate with <MAC '0017508204' [AC1]> (try 1/3)
[ 17.765638] wlan0: RX AssocResp from <MAC '0017508204' [AC1]> (capab=0x431 status=0 aid=3)
[ 17.765918] wlan0: associated
[ 18.022633] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 276.690542] wlan0: deauthenticating from <MAC '0017508204' [AC1]> by local choice (Reason: 3=DEAUTH_LEAVING)
[ 315.151677] wlan0: authenticate with <MAC address>
[ 315.164251] wlan0: send auth to <MAC address> (try 1/3)
[ 315.224214] wlan0: authenticated
[ 315.227974] wlan0: associate with <MAC address> (try 1/3)
[ 315.234425] wlan0: RX AssocResp from <MAC address> (capab=0x431 status=0 aid=1)
[ 315.234758] wlan0: associated
[ 315.458559] wlan0: Limiting TX power to 30 (30 - 0) dBm as advertised by <MAC address>
[ 325.238952] wlan0: deauthenticating from <MAC address> by local choice (Reason: 3=DEAUTH_LEAVING)
[ 326.293183] wlan0: authenticate with <MAC address>
[ 326.316842] wlan0: send auth to <MAC address> (try 1/3)
[ 326.321809] wlan0: authenticated
[ 326.331487] wlan0: associate with <MAC address> (try 1/3)
[ 326.369624] wlan0: RX AssocResp from <MAC address> (capab=0x431 status=0 aid=1)
[ 326.369911] wlan0: associated
[ 326.396211] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 326.620152] wlan0: Limiting TX power to 30 (30 - 0) dBm as advertised by <MAC address>
[ 2653.982347] wlan0: deauthenticating from <MAC address> by local choice (Reason: 3=DEAUTH_LEAVING)
[ 2654.523827] wlan0: authenticate with <MAC '0017508204' [AC1]>
[ 2655.032388] wlan0: send auth to <MAC '0017508204' [AC1]> (try 1/3)
[ 2655.034529] wlan0: authenticated
[ 2655.036442] wlan0: associate with <MAC '0017508204' [AC1]> (try 1/3)
[ 2655.042752] wlan0: RX AssocResp from <MAC '0017508204' [AC1]> (capab=0x431 status=0 aid=1)
[ 2655.043005] wlan0: associated
[ 2655.091078] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
########## wireless info END ############
答案1
在您的粘贴中，我们看到：
libkmod：错误 ../libkmod/libkmod-config.c:656 kmod_config_parse：/etc/modprobe.d/rtl8723be.conf 第 2 行：忽略以“exit”开头的错误行
这个文件中没有任何有用的内容；让我们将其删除：
sudo rm /etc/modprobe.d/rtl8723be.conf
接下来，请检查路由器中的设置。最好使用 WPA2-AES；不要使用任何 WPA 和 WPA2 混合模式，并且当然不是TKIP。其次，如果您的路由器支持 N 速度，那么在 2.4 GHz 频段使用 20 MHz 的信道宽度（而不是自动 20/40 MHz）可能会获得更好的连接性，尽管这可能会影响 N 速度。我建议使用固定信道（1、6 或 11），而不是自动信道选择。此外，请确保路由器未设置为仅使用 N 速度；自动 B、G 和 N 是首选。进行这些更改后，重新启动路由器。
接下来，我建议明确设置你的监管范围。检查你的：
sudo iw reg get
如果您选择 00，则这是一个通用的设置。请在此处查找您的设置：http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2然后暂时设置一下：
sudo iw reg set IS
当然，如果不是冰岛，请替换您的国家代码。永久设置它：
sudo nano /etc/default/crda
将最后一行改为：
REGDOMAIN=IS
仔细校对，保存并关闭文本编辑器。
重新启动并告诉我们是否有任何改进。
答案2
跑步
sudo tee /etc/modprobe.d/rtl8723be.conf <<< "options rtl8723be ant_sel=2"
然后重新启动。
如果这没有帮助，请尝试ant_sel=1。
这将设置驱动程序使用正确的天线。
答案3
放弃并安装了一个 USB wifi 设备。读到这台笔记本电脑的主要问题是 wifi 内置天线的范围太小。这解决了这个问题。