笔记：这个问题可以重复，但我尝试的大多数解决方案都没有用。
我的内核版本是：4.15.0.45我使用的是 Ubuntu 16.04。Windows 的网速要快得多。
以下是运行无线扩展脚本后得到的输出
########## wireless info START ##########
Report from: 13 Feb 2019 19:41 IST +0530
Booted last: 13 Feb 2019 00:00 IST +0530
Script from: 22 Oct 2018 03:34 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Codename: xenial
##### kernel ############################
Linux 4.15.0-45-generic #48~16.04.1-Ubuntu SMP Tue Jan 29 18:03:48 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
Ubuntu
##### lspci #############################
1b:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 15)
Subsystem: Micro-Star International Co., Ltd. [MSI] RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1462:7a36]
Kernel driver in use: r8169
##### lsusb #############################
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID 046d:c31d Logitech, Inc. Media Keyboard K200
Bus 003 Device 002: ID 046d:c077 Logitech, Inc. M105 Optical Mouse
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 2357:0109
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info ##################
##### rfkill ############################
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
##### secure boot #######################
SecureBoot disabled
Platform is in Setup Mode
##### lsmod #############################
rtl8xxxu 122880 0
mac80211 778240 1 rtl8xxxu
cfg80211 622592 1 mac80211
wmi_bmof 16384 0
mxm_wmi 16384 1 nouveau
wmi 24576 3 wmi_bmof,mxm_wmi,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: enp27s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether <MAC 'enp27s0' [IF1]> brd <MAC address>
3: wlx<IF from MAC [IF2]>: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether <MAC 'wlx<IF from MAC [IF2]>' [IF2]> brd <MAC address>
inet 192.168.1.12/24 brd 192.168.1.255 scope global dynamic wlx<IF from MAC [IF2]>
valid_lft 85380sec preferred_lft 85380sec
inet6 fe80::3eb0:87ca:b97a:b16b/64 scope link
valid_lft forever preferred_lft forever
##### iwconfig ##########################
lo no wireless extensions.
enp27s0 no wireless extensions.
wlx<IF from MAC [IF2]> IEEE 802.11 ESSID:"buyBTC"
Mode:Managed Frequency:2.412 GHz Access Point: <MAC 'buyBTC' [AN1]>
Bit Rate=1 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
Link Quality=26/70 Signal level=-84 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:79 Missed beacon:0
##### route #############################
default via 192.168.1.1 dev wlx<IF from MAC [IF2]> proto static metric 600
169.254.0.0/16 dev wlx<IF from MAC [IF2]> scope link metric 1000
192.168.1.0/24 dev wlx<IF from MAC [IF2]> proto kernel scope link src 192.168.1.12 metric 600
##### resolv.conf #######################
[777 root '/etc/resolv.conf' -> '../run/resolvconf/resolv.conf']
nameserver 127.0.1.1
##### network managers ##################
Installed:
NetworkManager
Running:
root 920 1 0 19:20 ? 00:00:00 /usr/sbin/NetworkManager --no-daemon
##### NetworkManager info ###############
GENERAL.DEVICE: wlx<IF from MAC [IF2]>
GENERAL.TYPE: wifi
GENERAL.NM-TYPE: NMDeviceWifi
GENERAL.VENDOR: Realtek
GENERAL.PRODUCT: 802.11n NIC
GENERAL.DRIVER: rtl8xxxu
GENERAL.DRIVER-VERSION: 4.15.0-45-generic
GENERAL.FIRMWARE-VERSION: N/A
GENERAL.HWADDR: <MAC 'wlx<IF from MAC [IF2]>' [IF2]>
GENERAL.MTU: 0
GENERAL.STATE: 100 (connected)
GENERAL.REASON: 0 (No reason given)
GENERAL.UDI: /sys/devices/pci0000:00/0000:00:01.3/0000:03:00.0/usb1/1-2/1-2:1.0/net/wlx<IF from MAC [IF2]>
GENERAL.IP-IFACE: wlx<IF from MAC [IF2]>
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: buyBTC 2
GENERAL.CON-UUID: 41731f3b-4a1b-4832-a96b-ebbbda1e210f
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/0
GENERAL.METERED: no (guessed)
CAPABILITIES.CARRIER-DETECT: no
CAPABILITIES.SPEED: 1 Mb/s
CAPABILITIES.IS-SOFTWARE: no
WIFI-PROPERTIES.WEP: yes
WIFI-PROPERTIES.WPA: yes
WIFI-PROPERTIES.WPA2: yes
WIFI-PROPERTIES.TKIP: yes
WIFI-PROPERTIES.CCMP: yes
WIFI-PROPERTIES.AP: no
WIFI-PROPERTIES.ADHOC: no
WIFI-PROPERTIES.2GHZ: yes
WIFI-PROPERTIES.5GHZ: no
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: /org/freedesktop/NetworkManager/Settings/{3}
CONNECTIONS.AVAILABLE-CONNECTIONS[1]: 41731f3b-4a1b-4832-a96b-ebbbda1e210f | buyBTC 2
IP4.ADDRESS[1]: 192.168.1.12/24
IP4.GATEWAY: 192.168.1.1
IP4.ROUTE[1]: dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.DNS[1]: 192.168.1.1
DHCP4.OPTION[1]: requested_routers = 1
DHCP4.OPTION[2]: requested_domain_search = 1
DHCP4.OPTION[3]: requested_time_offset = 1
DHCP4.OPTION[4]: requested_domain_name = 1
DHCP4.OPTION[5]: requested_rfc3442_classless_static_routes = 1
DHCP4.OPTION[6]: requested_broadcast_address = 1
DHCP4.OPTION[7]: requested_wpad = 1
DHCP4.OPTION[8]: requested_netbios_scope = 1
DHCP4.OPTION[9]: next_server = 0.0.0.0
DHCP4.OPTION[10]: expiry = 1550152488
DHCP4.OPTION[11]: requested_interface_mtu = 1
DHCP4.OPTION[12]: requested_subnet_mask = 1
DHCP4.OPTION[13]: dhcp_lease_time = 86400
DHCP4.OPTION[14]: dhcp_message_type = 5
DHCP4.OPTION[15]: ip_address = 192.168.1.12
DHCP4.OPTION[16]: requested_static_routes = 1
DHCP4.OPTION[17]: requested_domain_name_servers = 1
DHCP4.OPTION[18]: dhcp_renewal_time = 43200
DHCP4.OPTION[19]: routers = 192.168.1.1
DHCP4.OPTION[20]: broadcast_address = 192.168.1.255
DHCP4.OPTION[21]: domain_name_servers = 192.168.1.1
DHCP4.OPTION[22]: requested_ntp_servers = 1
DHCP4.OPTION[23]: requested_netbios_name_servers = 1
DHCP4.OPTION[24]: dhcp_rebinding_time = 75600
DHCP4.OPTION[25]: requested_ms_classless_static_routes = 1
DHCP4.OPTION[26]: subnet_mask = 255.255.255.0
DHCP4.OPTION[27]: network_number = 192.168.1.0
DHCP4.OPTION[28]: requested_host_name = 1
DHCP4.OPTION[29]: dhcp_server_identifier = 192.168.1.1
IP6.ADDRESS[1]: fe80::3eb0:87ca:b97a:b16b/64
IP6.GATEWAY: fe80::1
IP6.ROUTE[1]: dst = fe80::1/128, nh = ::, mt = 600
IP6.DNS[1]: fe80::1
DHCP6.OPTION[1]: requested_dhcp6_domain_search = 1
DHCP6.OPTION[2]: dhcp6_name_servers = fe80::1
DHCP6.OPTION[3]: dhcp6_server_id = 0:3:0:1:<MAC address>
DHCP6.OPTION[4]: requested_dhcp6_client_id = 1
DHCP6.OPTION[5]: requested_dhcp6_name_servers = 1
DHCP6.OPTION[6]: dhcp6_client_id = 0:4:39:e5:1b:7a:87:1d:44:1e:ae:ee:fb:15:c7:75:4c:23
GENERAL.DEVICE: enp27s0
GENERAL.TYPE: ethernet
GENERAL.NM-TYPE: NMDeviceEthernet
GENERAL.VENDOR: Realtek Semiconductor Co., Ltd.
GENERAL.PRODUCT: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
GENERAL.DRIVER: r8169
GENERAL.DRIVER-VERSION: 2.3LK-NAPI
GENERAL.FIRMWARE-VERSION:
GENERAL.HWADDR: <MAC 'enp27s0' [IF1]>
GENERAL.MTU: 1500
GENERAL.STATE: 20 (unavailable)
GENERAL.REASON: 2 (Device is now managed)
GENERAL.UDI: /sys/devices/pci0000:00/0000:00:01.3/0000:03:00.2/0000:16:04.0/0000:1b:00.0/net/enp27s0
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: yes
CAPABILITIES.SPEED: unknown
CAPABILITIES.IS-SOFTWARE: no
WIRED-PROPERTIES.CARRIER: off
CONNECTIONS.AVAILABLE-CONNECTION-PATHS:
SSID BSSID MODE CHAN FREQ RATE SIGNAL BARS SECURITY ACTIVE *
buyBTC <MAC 'buyBTC' [AN1]> Infra 1 2412 MHz 54 Mbit/s 36 ▂▄__ WPA1 WPA2 yes *
808 <MAC '808' [AN2]> Infra 7 2442 MHz 54 Mbit/s 20 ▂___ WPA1 WPA2 no
##### NetworkManager.state ##############
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
##### NetworkManager config #############
[[/etc/NetworkManager/conf.d/default-wifi-powersave-on.conf]]
[connection]
wifi.powersave = 3
[[/etc/NetworkManager/NetworkManager.conf]]
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=false
##### NetworkManager profiles ###########
[[/etc/NetworkManager/system-connections/buyBTC 1]] (600 root)
[connection] id=buyBTC 1 | type=wifi | permissions=user:python:;
[wifi] mac-address=<MAC address> | mac-address-blacklist= | ssid=buyBTC
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/buyBTC 2]] (600 root)
[connection] id=buyBTC 2 | type=wifi | permissions=user:python:;
[wifi] mac-address=<MAC 'wlx<IF from MAC [IF2]>' [IF2]> | mac-address-blacklist= | ssid=buyBTC
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/buyBTC]] (600 root)
[connection] id=buyBTC | type=wifi | permissions=user:python:;
[wifi] mac-address=<MAC address> | mac-address-blacklist= | ssid=buyBTC
[ipv4] method=auto
[ipv6] method=auto
##### Netplan config ####################
##### iw reg get ########################
Region: Asia/Kolkata (based on set time zone)
country IN: DFS-UNSET
(2402 - 2482 @ 40), (N/A, 20), (N/A)
(5150 - 5350 @ 160), (N/A, 23), (N/A)
(5725 - 5875 @ 80), (N/A, 23), (N/A)
##### iwlist channels ###################
lo no frequency information.
enp27s0 no frequency information.
wlx<IF from MAC [IF2]> 13 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
Channel 12 : 2.467 GHz
Channel 13 : 2.472 GHz
Current Frequency:2.412 GHz (Channel 1)
##### iwlist scan #######################
lo Interface doesn't support scanning.
wlx<IF from MAC [IF2]> Failed to read scan data : Resource temporarily unavailable
enp27s0 Interface doesn't support scanning.
##### module infos ######################
[rtl8xxxu]
filename: /lib/modules/4.15.0-45-generic/kernel/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.ko
firmware: rtlwifi/rtl8723bu_bt.bin
firmware: rtlwifi/rtl8723bu_nic.bin
firmware: rtlwifi/rtl8192eu_nic.bin
firmware: rtlwifi/rtl8192cufw_TMSC.bin
firmware: rtlwifi/rtl8192cufw_B.bin
firmware: rtlwifi/rtl8192cufw_A.bin
firmware: rtlwifi/rtl8723aufw_B_NoBT.bin
firmware: rtlwifi/rtl8723aufw_B.bin
firmware: rtlwifi/rtl8723aufw_A.bin
license: GPL
description: RTL8XXXu USB mac80211 Wireless LAN Driver
author: Jes Sorensen <[email protected]>
srcversion: E7E78FAA920143C9B0CB35A
depends: mac80211
retpoline: Y
intree: Y
name: rtl8xxxu
vermagic: 4.15.0-45-generic SMP mod_unload
parm: debug:Set debug mask (int)
parm: ht40_2g:Enable HT40 support on the 2.4GHz band (bool)
parm: dma_aggregation:Enable DMA packet aggregation (bool)
parm: dma_agg_timeout:Set DMA aggregation timeout (range 1-127) (int)
parm: dma_agg_pages:Set DMA aggregation pages (range 1-127, 0 to disable) (int)
[mac80211]
filename: /lib/modules/4.15.0-45-generic/kernel/net/mac80211/mac80211.ko
license: GPL
description: IEEE 802.11 subsystem
srcversion: 10B87D6D65DDD085D1326C9
depends: cfg80211
retpoline: Y
intree: Y
name: mac80211
vermagic: 4.15.0-45-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/4.15.0-45-generic/kernel/net/wireless/cfg80211.ko
description: wireless configuration support
license: GPL
author: Johannes Berg
srcversion: 62FD05DCC5AEEA290640C3D
depends:
retpoline: Y
intree: Y
name: cfg80211
vermagic: 4.15.0-45-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 #################
grep: /sys/module/rtl8xxxu/parameters/debug: Permission denied
grep: /sys/module/rtl8xxxu/parameters/dma_agg_pages: Permission denied
grep: /sys/module/rtl8xxxu/parameters/dma_aggregation: Permission denied
grep: /sys/module/rtl8xxxu/parameters/dma_agg_timeout: Permission denied
grep: /sys/module/rtl8xxxu/parameters/ht40_2g: Permission denied
[rtl8xxxu]
[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 ######################
##### 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/mlx4.conf]
softdep mlx4_core post: mlx4_en
##### rc.local ##########################
exit 0
##### pm-utils ##########################
##### udev rules ########################
##### dmesg #############################
[ 5.597209] IPv6: ADDRCONF(NETDEV_UP): enp27s0: link is not ready
[ 5.650858] r8169 0000:1b:00.0 enp27s0: link down
[ 5.650949] IPv6: ADDRCONF(NETDEV_UP): enp27s0: link is not ready
[ 202.833786] usb 1-2: rtl8192eu_parse_efuse: dumping efuse (0x200 bytes):
[ 202.833919] usb 1-2: rtl8xxxu: Loading firmware rtlwifi/rtl8192eu_nic.bin
[ 211.184539] rtl8xxxu 1-2:1.0 wlx<IF from MAC [IF2]>: renamed from wlan0
[ 211.224143] IPv6: ADDRCONF(NETDEV_UP): wlx<IF from MAC [IF2]>: link is not ready (repeated 3 times)
[ 235.621037] wlx<IF from MAC [IF2]>: authenticate with <MAC 'buyBTC' [AN1]>
[ 236.139821] wlx<IF from MAC [IF2]>: send auth to <MAC 'buyBTC' [AN1]> (try 1/3)
[ 236.141313] wlx<IF from MAC [IF2]>: authenticated
[ 236.144152] wlx<IF from MAC [IF2]>: associate with <MAC 'buyBTC' [AN1]> (try 1/3)
[ 236.149320] wlx<IF from MAC [IF2]>: RX AssocResp from <MAC 'buyBTC' [AN1]> (capab=0x411 status=0 aid=1)
[ 236.190419] usb 1-2: rtl8xxxu_bss_info_changed: HT supported
[ 236.224021] wlx<IF from MAC [IF2]>: associated
[ 236.304806] IPv6: ADDRCONF(NETDEV_CHANGE): wlx<IF from MAC [IF2]>: link becomes ready
########## wireless info END ############
我尝试过！
我检查了答案这里但我不存在这个问题。
另一个答案我已检查（未尝试）这里但问题是我没有看到任何使用iwconfig命令的无线扩展[这很奇怪，因为适配器已连接并且网络运行缓慢]
lo no wireless extensions.
wlx503eaaad2171 IEEE 802.11 ESSID:"buyBTC"
Mode:Managed Frequency:2.412 GHz Access Point: A8:25:EB:D6:2A:49
Bit Rate=1 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
Link Quality=32/70 Signal level=-78 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:171 Missed beacon:0
enp27s0 no wireless extensions.