我已经使用 Ubuntu 18.04 几个月了（与 Windows 10 双启动，没有任何问题），昨天，我的 Wi-Fi 适配器突然停止工作（没有列出任何内容）甚至停止显示。
关于这个问题有很多问题，但到目前为止，我都找不到任何解决办法。以下是我尝试过的方法：
编辑：经过几次重新启动并使用 Windows 后，我再次尝试，现在它显示无线适配器（“已禁用”）：
lshw -C network
WARNING: you should run this program as super-user.
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:04:00.0
logical name: enp4s0
version: 10
serial: 64:1c:67:a9:cd:7c
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 firmware=rtl8168g-3_0.0.1 04/23/13 latency=0 link=no multicast=yes port=MII
resources: irq:16 ioport:3000(size=256) memory:a1304000-a1304fff memory:a1300000-a1303fff
*-generic DISABLED
description: Wireless interface
product: RTL8822BE 802.11a/b/g/n/ac WiFi adapter
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:05:00.0
logical name: wlp5s0
version: ff
serial: c0:b5:d7:a2:1b:65
width: 32 bits
clock: 66MHz
capabilities: bus_master vga_palette cap_list ethernet physical wireless
configuration: broadcast=yes driver=rtw_pci driverversion=5.4.0-42-generic firmware=N/A latency=255 link=no maxlatency=255 mingnt=255 multicast=yes wireless=IEEE 802.11
resources: irq:142 ioport:2000(size=256) memory:a1200000-a120ffff
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.
但我实际上可以在这里看到 Wi-Fi 控制器：
sudo lspci
[...]
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader (rev 01)
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)
05:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8822BE 802.11a/b/g/n/ac WiFi adapter (rev ff)
07:00.0 Non-Volatile memory controller: SK hynix BC501 NVMe Solid State Drive 512GB
以及 RTL8822BE 的驱动模块（rtw88) 也可见：
sudo lsmod
Module Size Used by
cpuid 16384 0
rfcomm 81920 16
cmac 16384 3
algif_hash 16384 1
algif_skcipher 16384 1
af_alg 24576 6 algif_hash,algif_skcipher
bnep 24576 2
nls_iso8859_1 16384 1
snd_sof_pci 20480 0
snd_sof_intel_hda_common 69632 1 snd_sof_pci
snd_soc_hdac_hda 24576 1 snd_sof_intel_hda_common
snd_sof_intel_hda 20480 1 snd_sof_intel_hda_common
snd_sof_intel_byt 20480 1 snd_sof_pci
snd_sof_intel_ipc 20480 1 snd_sof_intel_byt
snd_sof 106496 4 snd_sof_pci,snd_sof_intel_hda_common,snd_sof_intel_byt,snd_sof_intel_ipc
snd_sof_xtensa_dsp 16384 1 snd_sof_pci
snd_hda_codec_hdmi 61440 1
snd_hda_ext_core 28672 3 snd_sof_intel_hda_common,snd_soc_hdac_hda,snd_sof_intel_hda
snd_soc_acpi_intel_match 32768 2 snd_sof_pci,snd_sof_intel_hda_common
snd_hda_codec_conexant 28672 1
snd_hda_codec_generic 81920 1 snd_hda_codec_conexant
snd_soc_acpi 16384 2 snd_sof_pci,snd_soc_acpi_intel_match
snd_soc_core 245760 3 snd_sof,snd_sof_intel_hda_common,snd_soc_hdac_hda
snd_compress 24576 1 snd_soc_core
ac97_bus 16384 1 snd_soc_core
snd_pcm_dmaengine 16384 1 snd_soc_core
x86_pkg_temp_thermal 20480 0
intel_powerclamp 20480 0
snd_hda_intel 53248 3
snd_intel_dspcfg 24576 3 snd_hda_intel,snd_sof_pci,snd_sof_intel_hda_common
coretemp 20480 0
snd_hda_codec 131072 5 snd_hda_codec_generic,snd_hda_codec_conexant,snd_hda_codec_hdmi,snd_hda_intel,snd_soc_hdac_hda
uvcvideo 98304 0
kvm_intel 286720 0
kvm 663552 1 kvm_intel
videobuf2_vmalloc 20480 1 uvcvideo
videobuf2_memops 20480 1 videobuf2_vmalloc
snd_hda_core 90112 9 snd_hda_codec_generic,snd_hda_codec_conexant,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_ext_core,snd_hda_codec,snd_sof_intel_hda_common,snd_soc_hdac_hda,snd_sof_intel_hda
videobuf2_v4l2 24576 1 uvcvideo
videobuf2_common 49152 2 videobuf2_v4l2,uvcvideo
thinkpad_acpi 110592 0
crct10dif_pclmul 16384 1
videodev 225280 3 videobuf2_v4l2,uvcvideo,videobuf2_common
ghash_clmulni_intel 16384 0
btusb 57344 0
mc 53248 4 videodev,videobuf2_v4l2,uvcvideo,videobuf2_common
aesni_intel 372736 4
nvram 16384 1 thinkpad_acpi
snd_hwdep 20480 1 snd_hda_codec
snd_pcm 106496 8 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_sof,snd_sof_intel_hda_common,snd_soc_core,snd_hda_core,snd_pcm_dmaengine
crypto_simd 16384 1 aesni_intel
cryptd 24576 3 crypto_simd,ghash_clmulni_intel
ledtrig_audio 16384 4 snd_hda_codec_generic,snd_hda_codec_conexant,snd_sof,thinkpad_acpi
snd_seq_midi 20480 0
rtwpci 24576 0
rtw88 610304 1 rtwpci
btrtl 24576 1 btusb
glue_helper 16384 1 aesni_intel
mei_hdcp 24576 0
snd_seq_midi_event 16384 1 snd_seq_midi
snd_rawmidi 36864 1 snd_seq_midi
snd_seq 69632 2 snd_seq_midi,snd_seq_midi_event
intel_rapl_msr 20480 0
btbcm 16384 1 btusb
input_leds 16384 0
joydev 24576 0
btintel 24576 1 btusb
mac80211 843776 2 rtwpci,rtw88
serio_raw 20480 0
intel_cstate 20480 0
intel_rapl_perf 20480 0
cfg80211 704512 2 mac80211,rtw88
snd_seq_device 16384 3 snd_seq,snd_seq_midi,snd_rawmidi
snd_timer 36864 2 snd_seq,snd_pcm
bluetooth 581632 41 btrtl,btintel,btbcm,bnep,btusb,rfcomm
i915 1986560 14
libarc4 16384 1 mac80211
rtsx_pci_ms 24576 0
snd 90112 20 snd_hda_codec_generic,snd_seq,snd_hda_codec_conexant,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_timer,snd_compress,thinkpad_acpi,snd_soc_core,snd_pcm,snd_rawmidi
processor_thermal_device 24576 0
ecdh_generic 16384 2 bluetooth
intel_rapl_common 24576 2 intel_rapl_msr,processor_thermal_device
soundcore 16384 1 snd
int3403_thermal 16384 0
int340x_thermal_zone 16384 2 int3403_thermal,processor_thermal_device
intel_soc_dts_iosf 20480 1 processor_thermal_device
int3400_thermal 20480 0
acpi_thermal_rel 16384 1 int3400_thermal
ecc 28672 1 ecdh_generic
mei_me 40960 1
mei 106496 3 mei_hdcp,mei_me
drm_kms_helper 184320 1 i915
memstick 20480 1 rtsx_pci_ms
i2c_algo_bit 16384 1 i915
intel_pch_thermal 16384 0
fb_sys_fops 16384 1 drm_kms_helper
syscopyarea 16384 1 drm_kms_helper
sysfillrect 16384 1 drm_kms_helper
sysimgblt 16384 1 drm_kms_helper
wmi_bmof 16384 0
intel_wmi_thunderbolt 20480 0
mac_hid 16384 0
ucsi_acpi 16384 0
typec_ucsi 40960 1 ucsi_acpi
typec 45056 1 typec_ucsi
acpi_pad 184320 0
sch_fq_codel 20480 2
parport_pc 40960 0
ppdev 24576 0
lp 20480 0
parport 53248 3 parport_pc,lp,ppdev
drm 491520 5 drm_kms_helper,i915
ip_tables 32768 0
x_tables 40960 1 ip_tables
autofs4 45056 2
hid_generic 16384 0
usbhid 57344 0
hid 131072 2 usbhid,hid_generic
rtsx_pci_sdmmc 28672 0
crc32_pclmul 16384 0
psmouse 155648 0
nvme 49152 1
r8169 90112 0
nvme_core 102400 3 nvme
i2c_i801 32768 0
ahci 40960 1
realtek 24576 1
rtsx_pci 69632 2 rtsx_pci_sdmmc,rtsx_pci_ms
libahci 32768 1 ahci
wmi 32768 2 intel_wmi_thunderbolt,wmi_bmof
video 49152 2 thinkpad_acpi,i915
pinctrl_cannonlake 36864 0
pinctrl_intel 28672 1 pinctrl_cannonlake
甚至司机也在场：
ls /lib/firmware/rtlwifi/rtl8822befw.bin
/lib/firmware/rtlwifi/rtl8822befw.bin
和这里：
ls /lib/firmware/rtw88/rtw8822b_fw.bin
/lib/firmware/rtw88/rtw8822b_fw.bin
我尝试重新启动网络服务：
sudo service network-manager restart
我尝试重新安装 Ubuntu 18.04（3 次...）以及现在的 Ubuntu 20.04。什么都没起作用...最奇怪的是，当我从可启动的 USB 棒“尝试 Ubuntu 18.04”时，Wi-Fi 工作正常，我甚至可以在安装过程中连接到我的网络，但是一旦安装的版本启动，它就再也无法工作了。
谁能帮我？
这是ifconfig -a
enp4s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.86.215 netmask 255.255.255.0 broadcast 192.168.86.255
inet6 fe80::4454:48f6:fc28:db11 prefixlen 64 scopeid 0x20<link>
ether 64:1c:67:a9:cd:7c txqueuelen 1000 (Ethernet)
RX packets 13303 bytes 13329507 (13.3 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 11144 bytes 1302142 (1.3 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 2314 bytes 212337 (212.3 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2314 bytes 212337 (212.3 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlp5s0: flags=4098<BROADCAST,MULTICAST> mtu 1500
ether c0:b5:d7:a2:1b:65 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
答案1
编辑2：我终于找到了类似的错误描述这里（以及类似的这里在我的笔记本电脑上测试后，我可以确认问题仅在从更新的Linux ubuntu 5.4.0-42-generic内核启动时发生。
uname -a
Linux ubuntu 5.4.0-42-generic #46~18.04.1-Ubuntu SMP Fri Jul 10 07:21:24 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
dmesg | grep rtw
[ 10.321995] rtw_core: loading out-of-tree module taints kernel.
[ 10.322041] rtw_core: module verification failed: signature and/or required key missing - tainting kernel
[ 10.715315] rtw_8822be 0000:05:00.0: enabling device (0000 -> 0003)
[ 11.576504] rtw_8822be 0000:05:00.0: Firmware version 27.2.0, H2C version 13
[ 12.362399] rtw_8822be 0000:05:00.0 wlp5s0: renamed from wlan0
[ 154.000006] rtw_8822be 0000:05:00.0: failed to read ASPM, ret=-5
[ 154.003024] rtw_8822be 0000:05:00.0: failed to send h2c command
[ 154.147617] rtw_8822be 0000:05:00.0: firmware failed to restore hardware setting
[ 154.150646] rtw_8822be 0000:05:00.0: failed to send h2c command
为了测试是否存在这个问题，我必须从以前的内核（在我的情况下是Linux ubuntu 5.3.0-28-generic）启动。你可以这样做通过重新启动笔记本电脑，进入 Grub 屏幕，选择Advanced options from Ubuntu并选择要从其启动的先前版本。完成此操作后，我的 Wi-Fi 即可正常工作：
uname -a
Linux ubuntu 5.3.0-28-generic #30~18.04.1-Ubuntu SMP Fri Jan 17 06:14:09 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
dmesg | grep rtw
[ 12.777529] rtw_pci 0000:05:00.0: enabling device (0000 -> 0003)
[ 12.848050] rtw_pci 0000:05:00.0: pci msi enabled
[ 13.032126] rtw_pci 0000:05:00.0 wlp5s0: renamed from wlan0
lshw -C network
WARNING: you should run this program as super-user.
[...]
*-network
description: Wireless interface
product: RTL8822BE 802.11a/b/g/n/ac WiFi adapter
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:05:00.0
logical name: wlp5s0
version: 00
serial: c0:b5:d7:a2:1b:65
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rtw_pci driverversion=5.3.0-28-generic firmware=N/A ip=192.168.86.186 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:142 ioport:2000(size=256) memory:a1200000-a120ffff
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.
编辑1：这只是暂时的。问题又回来了。
现在显示为：
lshw -C network
WARNING: you should run this program as super-user.
[...]
*-generic
description: Wireless interface
product: Illegal Vendor ID
vendor: Illegal Vendor ID
physical id: 0
bus info: pci@0000:05:00.0
logical name: wlp5s0
version: ff
serial: c0:b5:d7:a2:1b:65
width: 32 bits
clock: 66MHz
capabilities: bus_master vga_palette cap_list ethernet physical wireless
configuration: broadcast=yes driver=rtw_8822be driverversion=5.4.0-42-generic firmware=N/A latency=255 link=no maxlatency=255 mingnt=255 multicast=yes wireless=IEEE 802.11
resources: irq:142 ioport:2000(size=256) memory:a1200000-a120ffff
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.
我正在再次尝试一切，比如这：
sudo make install
make -C /lib/modules/5.4.0-42-generic/build M=/home/diego/Downloads/rtw88 modules
make[1]: Entering directory '/usr/src/linux-headers-5.4.0-42-generic'
Building modules, stage 2.
MODPOST 10 modules
make[1]: Leaving directory '/usr/src/linux-headers-5.4.0-42-generic'
Install rtw88 SUCCESS
但它仍然不起作用。
第一个答案：
我不知道为什么或如何出现此问题，但这是我修复它的方法：
在重新安装了 Ubuntu 18.04 3 次和 Ubuntu 20.04 1 次（与 Windows 10 一起作为双启动）后，我删除了 Ubuntu 分区（从 Windows 磁盘管理器中删除），将未使用的空间重新合并到 Windows 分区并重新启动。之后我注意到 GNU GRUB 在每次启动时仍然处于活动状态。所以我按照这些步骤删除了 Ubuntu 中的所有内容，直到我的笔记本电脑恢复到我第一次安装 Ubuntu 之前的状态。只有 Windows 10。
所以我刚刚安装了 Ubuntu 18.04（再次与 Windows 10 一起作为双启动），现在一切都运行正常。就是这样。
答案2
嗨我尝试按照这个：
https://help.ubuntu.com/stable/ubuntu-help/net-wireless-troubleshooting-hardware-check.html.en
这很棒，但我无法让 RTL8822BE 工作。所以这是我的答案（如果不允许，请删除板上的第一个答案）。我为我的笔记本电脑（华硕 Vivobook）购买了另一张 wifi/BT m.2 卡。
我懂了：
英特尔 Wireless-Ac 9260、2230、2X2 Ac+Bt、千兆、无 Vpro。据说它是为第 8 代英特尔处理器设计的，我的笔记本电脑就配备了这种处理器。
这非常简单。移除并更换卡连接器和天线，与 Realtek 相同。启动我的操作系统 W10 或 Ubuntu 并运行更新，选择我的 WiFi 网络并登录。价格为 17 美元
如果你真的陷入困境我希望这会有所帮助。