我有一台 ubuntu 16.04，带有 TP-Link WN722N AR9271 芯片组。几个月来它一直运行良好，但后来偶尔会断线。当我开始尝试修复这个问题，并进行了几次升级后……情况变得越来越糟，直到今天我几乎无法在我的 ubuntu 机器上使用互联网。
我已经安装了 firmware-atheros，也安装了许多版本的 ath9k_htc 驱动程序。我已将 wifi.scan-rand-mac-address=no 行添加到 NetworkManager.conf 文件中。
我正在考虑备份我的系统并升级到 17 或 18 - 这会更新所有的网络驱动程序吗？
有没有办法无需升级即可将所有驱动程序和网络设置恢复为默认设置？
如果您需要更多信息来诊断问题，请直接询问，我们将不胜感激。
以下是所有相关细节和信息：
sudo lshw-类网络：
*-network
description: Ethernet interface
product: Ethernet Connection (5) I219-V
vendor: Intel Corporation
physical id: 1f.6
bus info: pci@0000:00:1f.6
logical name: enp0s31f6
version: 00
serial: 70:4d:7b:8a:37:e7
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k firmware=0.1-4 latency=0 link=no multicast=yes port=twisted pair
resources: irq:127 memory:df100000-df11ffff
*-network
description: Wireless interface
physical id: 2
bus info: usb@3:1
logical name: wlx18d6c70bcdad
serial: 18:d6:c7:0b:cd:ad
capabilities: ethernet physical wireless
configuration: broadcast=yes driver=ath9k_htc driverversion=4.15.0-24-generic firmware=1.4 ip=192.168.1.33 link=yes multicast=yes wireless=IEEE 802.11
sudo iwlist 扫描
wlx18d6c70bcdad Scan completed :
Cell 01 - Address: C4:ED:34:D6:3F:0D
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=30/70 Signal level=-80 dBm
Encryption key:on
ESSID:"Manuel Araya"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=0000008145be5a56
Extra: Last beacon: 24ms ago
IE: Unknown: 000C4D616E75656C204172617961
IE: Unknown: 010882848B962430486C
IE: Unknown: 030106
IE: Unknown: 2A0104
IE: Unknown: 2F0104
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: Unknown: 32040C121860
IE: Unknown: 2D1A7E191BFFFF000001000000000000000000000000000000000000
IE: Unknown: 3D1606051700000000000000000000000000000000000000
IE: Unknown: DD760050F204104A0001101044000102103B0001031047001073C3D75D61A700EB200FCBB3A024432A1021000842726F6164636F6D1023000842726F6164636F6D1024000631323334353610420004313233341054000800060050F20400011011000A42726F6164636F6D4150100800020084103C000101
IE: Unknown: DD090010180207F02C0000
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
Cell 02 - Address: 1C:B0:44:C6:78:87
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=27/70 Signal level=-83 dBm
Encryption key:on
ESSID:"Wifi Puc\xC3\xB3n Chile"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=0000005e0f957de6
Extra: Last beacon: 1488ms ago
IE: Unknown: 00115769666920507563C3B36E204368696C65
IE: Unknown: 010882848B962430486C
IE: Unknown: 030106
IE: Unknown: 050402030000
IE: Unknown: 2A0100
IE: Unknown: 2F0100
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
IE: Unknown: 32040C121860
IE: Unknown: 0B0500002F0000
IE: Unknown: 2D1ABC181BFFFF000000000000000000000000000000000000000000
IE: Unknown: 3D1606081100000000000000000000000000000000000000
IE: Unknown: 7F080400080000000040
IE: Unknown: DD180050F204104A00011010440001021049000600372A000120
IE: Unknown: DD090010180200000C0000
IE: WPA Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
IE: Unknown: DD180050F2020101840003A4000027A4000042435E0062322F00
IE: Unknown: 46057200010000
lo 接口不支持扫描。
我的卡：
Atheros Communications, Inc. AR9271 802.11n
TL-WN722N
/etc/network/interfaces 文件：我已经注释掉底部的几行，因为它们没有解决问题。
# interfaces(5) file used by ifup(8) and ifdown(8)
source /etc/network/interfaces.d/*
# the loopback network interface
auto lo
iface lo inet loopback
# the primary network interface
# auto wlx18d6c70bcdad
# iface wlx18d6c70bcdad inet dhcp
sudo lsusb 输出：
Bus 003 Device 002: ID 0cf3:9271 Atheros Communications, Inc. AR9271 802.11n
sudo lsmod 输出：
Module Size Used by
ccm 20480 0
arc4 16384 2
ath9k_htc 77824 0
ath9k_common 36864 1 ath9k_htc
ath9k_hw 475136 2 ath9k_htc,ath9k_common
ath 28672 3 ath9k_htc,ath9k_hw,ath9k_common
mac80211 778240 1 ath9k_htc
cfg80211 622592 4 ath9k_htc,mac80211,ath,ath9k_common
nls_iso8859_1 16384 1
snd_hda_codec_hdmi 49152 1
snd_hda_codec_realtek 98304 1
snd_hda_codec_generic 73728 1 snd_hda_codec_realtek
snd_hda_intel 40960 5
snd_hda_codec 126976 4 snd_hda_intel,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_realtek
snd_hda_core 81920 5 snd_hda_intel,snd_hda_codec,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_realtek
snd_hwdep 20480 1 snd_hda_codec
snd_pcm 98304 5 snd_hda_intel,snd_hda_codec,snd_hda_core,snd_hda_codec_hdmi
intel_rapl 20480 0
x86_pkg_temp_thermal 16384 0
intel_powerclamp 16384 0
coretemp 16384 0
snd_seq_midi 16384 0
snd_seq_midi_event 16384 1 snd_seq_midi
snd_rawmidi 32768 1 snd_seq_midi
kvm 598016 0
irqbypass 16384 1 kvm
snd_seq 65536 2 snd_seq_midi_event,snd_seq_midi
crct10dif_pclmul 16384 0
crc32_pclmul 16384 0
ghash_clmulni_intel 16384 0
pcbc 16384 0
aesni_intel 188416 0
snd_seq_device 16384 3 snd_seq,snd_rawmidi,snd_seq_midi
aes_x86_64 20480 1 aesni_intel
crypto_simd 16384 1 aesni_intel
snd_timer 32768 2 snd_seq,snd_pcm
glue_helper 16384 1 aesni_intel
cryptd 24576 3 crypto_simd,ghash_clmulni_intel,aesni_intel
snd 81920 20 snd_hda_intel,snd_hwdep,snd_seq,snd_hda_codec,snd_timer,snd_rawmidi,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_seq_device,snd_hda_codec_realtek,snd_pcm
intel_cstate 20480 0
intel_rapl_perf 16384 0
eeepc_wmi 16384 0
asus_wmi 28672 1 eeepc_wmi
sparse_keymap 16384 1 asus_wmi
wmi_bmof 16384 0
serio_raw 16384 0
input_leds 16384 0
soundcore 16384 1 snd
shpchp 36864 0
mei_me 40960 0
mei 90112 1 mei_me
mac_hid 16384 0
acpi_pad 180224 0
parport_pc 36864 0
ppdev 20480 0
lp 20480 0
parport 49152 3 lp,parport_pc,ppdev
autofs4 40960 2
hid_generic 16384 0
usbhid 49152 0
hid 118784 2 hid_generic,usbhid
i915 1630208 59
i2c_algo_bit 16384 1 i915
drm_kms_helper 172032 1 i915
ahci 36864 3
mxm_wmi 16384 0
libahci 32768 1 ahci
e1000e 249856 0
syscopyarea 16384 1 drm_kms_helper
sysfillrect 16384 1 drm_kms_helper
psmouse 147456 0
sysimgblt 16384 1 drm_kms_helper
ptp 20480 1 e1000e
fb_sys_fops 16384 1 drm_kms_helper
pps_core 20480 1 ptp
drm 401408 7 i915,drm_kms_helper
wmi 24576 3 asus_wmi,wmi_bmof,mxm_wmi
video 45056 2 asus_wmi,i915
网络管理器配置文件
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=false
[device]
match-device=wlx18d6c70bcdad
wifi.scan-rand-mac-address=no
Ubuntu 连接设置： Ubuntu 连接设置
