将“/usr”文件夹的权限更改为 777 后，我收到与“sudo”权限相关的错误，并使用恢复模式修复了该错误。一切似乎都正常，但我遇到了另一个问题，那就是我的笔记本电脑无法连接到 wifi。在设置中显示“未找到 Wifi 适配器”。我尝试按照我找到的一些说明进行操作，但没有任何变化。这是一些命令的输出，我认为它们对诊断很有用：
namle5@1-namle5-u:~$ lshw -C network
WARNING: you should run this program as super-user.
*-network DISABLED
description: Wireless interface
product: Comet Lake PCH-LP CNVi WiFi
vendor: Intel Corporation
physical id: 14.3
bus info: pci@0000:00:14.3
logical name: wlp0s20f3
version: 00
serial: 6c:6a:77:71:08:63
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=5.15.0-58-generic firmware=66.f1c864e0.0 QuZ-a0-hr-b0-66.u latency=0 link=no multicast=yes wireless=IEEE 802.11
resources: irq:16 memory:f1210000-f1213fff
namle5@1-namle5-u:~$ ethtool -i wlan0 | grep driver
Cannot get driver information: No such device
namle5@1-namle5-u:~$ ifconfig wlan0 up
wlan0: ERROR while getting interface flags: No such device
namle5@1-namle5-u:~$ rfkill list
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: yes
Hard blocked: no
namle5@1-namle5-u:~$ lspci | egrep -i 'intel'
00:00.0 Host bridge: Intel Corporation Comet Lake-U v1 4c Host Bridge/DRAM Controller (rev 0c)
00:02.0 VGA compatible controller: Intel Corporation CometLake-U GT2 [UHD Graphics] (rev 02)
00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 0c)
00:12.0 Signal processing controller: Intel Corporation Comet Lake Thermal Subsytem
00:14.0 USB controller: Intel Corporation Comet Lake PCH-LP USB 3.1 xHCI Host Controller
00:14.2 RAM memory: Intel Corporation Comet Lake PCH-LP Shared SRAM
00:14.3 Network controller: Intel Corporation Comet Lake PCH-LP CNVi WiFi
00:14.5 SD Host controller: Intel Corporation Comet Lake PCH-LP SCS3
00:15.0 Serial bus controller: Intel Corporation Serial IO I2C Host Controller
00:16.0 Communication controller: Intel Corporation Comet Lake Management Engine Interface
00:17.0 SATA controller: Intel Corporation Comet Lake SATA AHCI Controller
00:1d.0 PCI bridge: Intel Corporation Comet Lake PCI Express Root Port #9 (rev f0)
00:1d.4 PCI bridge: Intel Corporation Comet Lake PCI Express Root Port #13 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Comet Lake PCH-LP LPC Premium Controller/eSPI Controller
00:1f.3 Multimedia audio controller: Intel Corporation Comet Lake PCH-LP cAVS
00:1f.4 SMBus: Intel Corporation Comet Lake PCH-LP SMBus Host Controller
00:1f.5 Serial bus controller: Intel Corporation Comet Lake SPI (flash) Controller
namle5@1-namle5-u:~$ lspci -vv -s 00:14.3
00:14.3 Network controller: Intel Corporation Comet Lake PCH-LP CNVi WiFi
Subsystem: Intel Corporation Wi-Fi 6 AX201 160MHz
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 16
Region 0: Memory at f1210000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi, wl
namle5@1-namle5-u:~$ lspci -knn | grep Net -A3; rfkill list
00:14.3 Network controller [0280]: Intel Corporation Comet Lake PCH-LP CNVi WiFi [8086:02f0]
Subsystem: Intel Corporation Wi-Fi 6 AX201 160MHz [8086:0074]
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi, wl
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: yes
Hard blocked: no
谢谢你的帮助