几个月前我全新安装了 Ubuntu 18.04 LTS，但是本周我通过 WiFi 连接的互联网突然停止工作了（但是网络共享可以正常进行：通过 USB 连接不稳定，通过蓝牙连接则比较可靠，而蓝牙就是我目前连接到这个网站的方式）。
我的设备是配备 Qualcomm Atheros 的 Dell XPS13：lshw -class network退货
description: Network controller
product: QCA6174 802.11ac Wireless Network Adapter
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:3a:00.0
version: 32
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=ath10k_pci latency=0
resources: irq:139 memory:dc000000-dc1fffff
所以没有逻辑名称；当我检查操作系统的设置时，我被告知“未找到 Wi-Fi 适配器 - 请确保已插入并打开 Wi-Fi 适配器”，事实上，当我运行时ifconfig我得到了
bnep0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.44.124 netmask 255.255.255.0 broadcast 192.168.44.255
inet6 fe80::ea16:24ce:ea72:9208 prefixlen 64 scopeid 0x20<link>
ether 9c:b6:d0:ed:90:24 txqueuelen 1000 (Ethernet)
RX packets 391 bytes 54441 (54.4 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 644 bytes 97056 (97.0 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp0s20f0u2: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.42.83 netmask 255.255.255.0 broadcast 192.168.42.255
inet6 fe80::45ba:d529:b72f:ffc8 prefixlen 64 scopeid 0x20<link>
ether 66:4d:6f:7e:70:65 txqueuelen 1000 (Ethernet)
RX packets 62043 bytes 62840918 (62.8 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 49542 bytes 14115031 (14.1 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 23793 bytes 1773826 (1.7 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 23793 bytes 1773826 (1.7 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
输出lsusb：
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 0c45:670c Microdia
Bus 001 Device 004: ID 04f3:20d0 Elan Microelectronics Corp.
Bus 001 Device 003: ID 0cf3:e300 Atheros Communications, Inc.
Bus 001 Device 010: ID 2717:ff80
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
任何建议都将不胜感激！到目前为止，在 askubuntu 上找不到任何有用的解决方案 - 所以这不是重复的。
更新
结果如下sudo modprobe ath10k_pci && dmesg | grep ath：
[ 2.784311] ath10k_pci 0000:3a:00.0: enabling device (0000 -> 0002)
[ 2.786981] ath10k_pci 0000:3a:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
[ 2.836893] Modules linked in: intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm ath10k_pci(+) snd_hda_codec_realtek(+) dell_laptop(+) snd_soc_skl irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_generic pcbc snd_soc_skl_ipc ath10k_core snd_hda_ext_core snd_soc_sst_dsp snd_soc_sst_ipc ath snd_soc_acpi snd_soc_core aesni_intel snd_compress mac80211(OE) ac97_bus aes_x86_64 snd_pcm_dmaengine sch_fq_codel crypto_simd glue_helper snd_hda_intel cryptd btusb uvcvideo(+) snd_hda_codec btrtl dell_wmi intel_cstate videobuf2_vmalloc snd_hda_core dell_smbios intel_rapl_perf videobuf2_memops btbcm snd_hwdep btintel videobuf2_v4l2 dcdbas videobuf2_core bluetooth joydev snd_pcm input_leds hid_multitouch videodev wmi_bmof cfg80211(OE) serio_raw dell_wmi_descriptor snd_seq_midi
[ 3.077620] ath10k_pci 0000:3a:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:3a:00.0.bin failed with error -2
[ 3.077626] ath10k_pci 0000:3a:00.0: Direct firmware load for ath10k/cal-pci-0000:3a:00.0.bin failed with error -2
[ 3.078902] ath10k_pci 0000:3a:00.0: qca6174 hw3.2 target 0x05030000 chip_id 0x00340aff sub 1a56:1535
[ 3.078903] ath10k_pci 0000:3a:00.0: kconfig debug 0 debugfs 1 tracing 1 dfs 0 testmode 0
[ 3.079273] ath10k_pci 0000:3a:00.0: firmware ver WLAN.RM.4.4.1-00079-QCARMSWPZ-1 api 6 features wowlan,ignore-otp crc32 fd869beb
[ 3.143217] ath10k_pci 0000:3a:00.0: board_file api 2 bmi_id N/A crc32 20d869c3
[ 3.723620] ath10k_pci 0000:3a:00.0: Unknown eventid: 118809
[ 3.726696] ath10k_pci 0000:3a:00.0: Unknown eventid: 90118
[ 3.727181] ath10k_pci 0000:3a:00.0: htt-ver 3.47 wmi-op 4 htt-op 3 cal otp max-sta 32 raw 0 hwcrypto 1
[ 3.813764] ath: EEPROM regdomain: 0x6c
[ 3.813765] ath: EEPROM indicates we should expect a direct regpair map
[ 3.813765] ath: Country alpha2 being used: 00
[ 3.813766] ath: Regpair used: 0x6c
[ 3.813798] Modules linked in: nls_iso8859_1 wl(POE) intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm ath10k_pci snd_hda_codec_realtek(+) dell_laptop snd_soc_skl irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_generic pcbc snd_soc_skl_ipc ath10k_core snd_hda_ext_core snd_soc_sst_dsp snd_soc_sst_ipc ath snd_soc_acpi snd_soc_core aesni_intel snd_compress mac80211(OE) ac97_bus aes_x86_64 snd_pcm_dmaengine sch_fq_codel crypto_simd glue_helper snd_hda_intel cryptd btusb uvcvideo snd_hda_codec btrtl dell_wmi intel_cstate videobuf2_vmalloc snd_hda_core dell_smbios intel_rapl_perf videobuf2_memops btbcm snd_hwdep btintel videobuf2_v4l2 dcdbas videobuf2_core bluetooth joydev snd_pcm input_leds hid_multitouch videodev wmi_bmof cfg80211(OE) serio_raw dell_wmi_descriptor
[ 3.813853] Workqueue: ath10k_wq ath10k_core_register_work [ath10k_core]
[ 3.813870] ? ath10k_regd_update+0x2a0/0x2a0 [ath10k_core]
[ 3.813872] ath_regd_init+0x98/0x150 [ath]
[ 3.813875] ath10k_mac_register+0x5e3/0x8e0 [ath10k_core]
[ 3.813879] ath10k_core_register_work+0x651/0x7f0 [ath10k_core]
[ 3.813923] Modules linked in: nls_iso8859_1 wl(POE) intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm ath10k_pci snd_hda_codec_realtek(+) dell_laptop snd_soc_skl irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_generic pcbc snd_soc_skl_ipc ath10k_core snd_hda_ext_core snd_soc_sst_dsp snd_soc_sst_ipc ath snd_soc_acpi snd_soc_core aesni_intel snd_compress mac80211(OE) ac97_bus aes_x86_64 snd_pcm_dmaengine sch_fq_codel crypto_simd glue_helper snd_hda_intel cryptd btusb uvcvideo snd_hda_codec btrtl dell_wmi intel_cstate videobuf2_vmalloc snd_hda_core dell_smbios intel_rapl_perf videobuf2_memops btbcm snd_hwdep btintel videobuf2_v4l2 dcdbas videobuf2_core bluetooth joydev snd_pcm input_leds hid_multitouch videodev wmi_bmof cfg80211(OE) serio_raw dell_wmi_descriptor
[ 3.813962] Workqueue: ath10k_wq ath10k_core_register_work [ath10k_core]
[ 3.813976] ? ath10k_regd_update+0x2a0/0x2a0 [ath10k_core]
[ 3.813977] ath_regd_init+0x98/0x150 [ath]
[ 3.813980] ath10k_mac_register+0x5e3/0x8e0 [ath10k_core]
[ 3.813984] ath10k_core_register_work+0x651/0x7f0 [ath10k_core]
[ 3.814013] ath10k_pci 0000:3a:00.0: failed to register ieee80211: -22
[ 3.814015] ath10k_pci 0000:3a:00.0: could not register to mac80211 (-22)
答案1
代码：
sudo apt remove bcmwl-kernel-source && sudo apt install git dkms
git clone -b extended https://github.com/lwfinger/rtlwifi_new.git
sudo dkms add ./rtlwifi_new
sudo dkms install rtlwifi-new/0.6
重启。如果您发现信号弱，请尝试
sudo modprobe -r rtl8723de && sleep 5 && sudo modprobe rtl8723de ant_sel=1
看看是否更好，如果没有，那就做
sudo modprobe -r rtl8723de && sleep 5 && sudo modprobe rtl8723de ant_sel=2
如果这不起作用，我还可以建议一件事：您必须从另一台计算机或通过互联网复制并粘贴 Wifi 适配器并进行安装。我不知道如何这样做，但也许如果你做一些研究，你会找到答案。
答案2
更新：自那以后，同样的行为反复发生，主要是在 Ubuntu 更新后（但并非总是如此）。我最近意识到，至少对我来说，解决方案是简单地关闭笔记本电脑并重新启动。奇怪的是，重新启动它是不够的。
答案3
经过大量搜索，我终于发现该问题与 Killer Wifi 驱动程序有关。使用指示在 Killer 官方支持页面上. 它列出了以下命令。
sudo add-apt-repository ppa:canonical-hwe-team/backport-iwlwifi
sudo apt-get update
sudo apt-get install backport-iwlwifi-dkms
reboot
尽管它是为 ubuntu 16.04 列出的，但对我来说它也适用于 18.04。