系统：Dell Precision T3400 双启动 Windows 10/Ubuntu。系统目前通过以太网连接到互联网。更新到 Ubuntu 20.04 后，我在尝试使用 EDUP EP-AC1661 Wi-Fi 适配器时遇到“未找到 Wi-Fi 适配器”的情况。我已从下载了此适配器的 Linux 驱动程序http://www.szedup.com/ep-ac1661/，提取了存档并双击了 RTL8821CU_WiFi_linux_v5.2.5.1_22211_COEX20170310-1212.20170517 文件夹中的所有 install.sh 文件。我在 Synaptic 上搜索了 RTL8821CU，但 Synaptic 返回：“无法下载所有存储库索引”我尝试按照搜索“未找到 Wi-Fi Adaper Ubuntu 20.04”来源后得到的文章中的建议操作，但无济于事，这很可能是因为我对 Linux 缺乏专业知识：
“wireless-info.txt”的输出如下：
########## wireless info START ##########
Report from: 21 Nov 2020 14:57 CST -0600
Booted last: 21 Nov 2020 00:00 CST -0600
Script from: 22 Oct 2018 03:34 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Codename: focal
##### kernel ############################
Linux 5.4.0-54-generic #60-Ubuntu SMP Fri Nov 6 10:37:59 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
Ubuntu
##### lspci #############################
04:00.0 Ethernet controller [0200]: Broadcom Inc. and subsidiaries NetXtreme BCM5754 Gigabit Ethernet PCI Express [14e4:167a] (rev 02)
Subsystem: Dell Precision T3400 [1028:0214]
Kernel driver in use: tg3
##### lsusb #############################
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 004: ID 0bda:0811 Realtek Semiconductor Corp. 802.11ac WLAN Adapter
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 002: ID 0461:0010 Primax Electronics, Ltd HP PR1101U / Primax PMX-KPR1101U Keyboard
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
##### PCMCIA card info ##################
##### rfkill ############################
##### secure boot #######################
'mokutil' is not installed (package "mokutil").
##### lsmod #############################
##### 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: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether <MAC 'enp4s0' [IF1]> brd <MAC address>
inet 192.168.1.84/24 brd 192.168.1.255 scope global dynamic noprefixroute enp4s0
valid_lft 82672sec preferred_lft 82672sec
inet6 2600:1700:67b2:36a0::47/128 scope global dynamic noprefixroute
valid_lft 3524sec preferred_lft 3524sec
inet6 fd2d:9091:5573:1:a903:bdb7:a9e5:ab4/64 scope global temporary dynamic
valid_lft 6899sec preferred_lft 6899sec
inet6 fd2d:9091:5573:1:5a74:a87b:36cd:ca46/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 6899sec preferred_lft 6899sec
inet6 2600:1700:67b2:36a0:a903:bdb7:a9e5:ab4/64 scope global temporary dynamic
valid_lft 3330sec preferred_lft 3330sec
inet6 2600:1700:67b2:36a0:2f20:5b7d:8e25:350b/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 3330sec preferred_lft 3330sec
inet6 fe80::51fa:9873:3a0d:92e9/64 scope link noprefixroute
valid_lft forever preferred_lft forever
##### iwconfig ##########################
enp4s0 no wireless extensions.
lo no wireless extensions.
##### route #############################
default via 192.168.1.254 dev enp4s0 proto dhcp metric 100
169.254.0.0/16 dev enp4s0 scope link metric 1000
192.168.1.0/24 dev enp4s0 proto kernel scope link src 192.168.1.84 metric 100
##### resolv.conf #######################
[777 root '/etc/resolv.conf' -> '../run/systemd/resolve/stub-resolv.conf']
nameserver 127.0.0.53
options edns0 trust-ad
search attlocal.net
##### network managers ##################
Installed:
NetworkManager
Running:
root 795 1 0 10:18 ? 00:00:01 /usr/sbin/NetworkManager --no-daemon
##### NetworkManager info ###############
GENERAL.DEVICE: enp4s0
GENERAL.TYPE: ethernet
GENERAL.NM-TYPE: NMDeviceEthernet
GENERAL.DBUS-PATH: /org/freedesktop/NetworkManager/Devices/2
GENERAL.VENDOR: Broadcom Inc. and subsidiaries
GENERAL.PRODUCT: NetXtreme BCM5754 Gigabit Ethernet PCI Express (Precision T3400)
GENERAL.DRIVER: tg3
GENERAL.DRIVER-VERSION: 3.137
GENERAL.FIRMWARE-VERSION: 5754-v3.24
GENERAL.HWADDR: <MAC 'enp4s0' [IF1]>
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.REASON: 0 (No reason given)
GENERAL.IP4-CONNECTIVITY: 4 (full)
GENERAL.IP6-CONNECTIVITY: 3 (limited)
GENERAL.UDI: /sys/devices/pci0000:00/0000:00:1c.5/0000:04:00.0/net/enp4s0
GENERAL.IP-IFACE: enp4s0
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: Wired connection 1
GENERAL.CON-UUID: 6ab51d0b-c1ad-3105-9293-afaab89a26d1
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/2
GENERAL.METERED: no (guessed)
CAPABILITIES.CARRIER-DETECT: yes
CAPABILITIES.SPEED: 1000 Mb/s
CAPABILITIES.IS-SOFTWARE: no
CAPABILITIES.SRIOV: no
INTERFACE-FLAGS.UP: yes
INTERFACE-FLAGS.LOWER-UP: yes
INTERFACE-FLAGS.CARRIER: yes
WIRED-PROPERTIES.CARRIER: on
IP4.ADDRESS[1]: 192.168.1.84/24
IP4.GATEWAY: 192.168.1.254
IP4.ROUTE[1]: dst = 0.0.0.0/0, nh = 192.168.1.254, mt = 100
IP4.ROUTE[2]: dst = 192.168.1.0/24, nh = 0.0.0.0, mt = 100
IP4.ROUTE[3]: dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.DNS[1]: 192.168.1.254
IP4.DOMAIN[1]: attlocal.net
DHCP4.OPTION[1]: dhcp_lease_time = 86400
DHCP4.OPTION[2]: domain_name = attlocal.net
DHCP4.OPTION[3]: domain_name_servers = 192.168.1.254
DHCP4.OPTION[4]: expiry = 1606074945
DHCP4.OPTION[5]: ip_address = 192.168.1.84
DHCP4.OPTION[6]: requested_broadcast_address = 1
DHCP4.OPTION[7]: requested_domain_name = 1
DHCP4.OPTION[8]: requested_domain_name_servers = 1
DHCP4.OPTION[9]: requested_domain_search = 1
DHCP4.OPTION[10]: requested_host_name = 1
DHCP4.OPTION[11]: requested_interface_mtu = 1
DHCP4.OPTION[12]: requested_ms_classless_static_routes = 1
DHCP4.OPTION[13]: requested_nis_domain = 1
DHCP4.OPTION[14]: requested_nis_servers = 1
DHCP4.OPTION[15]: requested_ntp_servers = 1
DHCP4.OPTION[16]: requested_rfc3442_classless_static_routes = 1
DHCP4.OPTION[17]: requested_root_path = 1
DHCP4.OPTION[18]: requested_routers = 1
DHCP4.OPTION[19]: requested_static_routes = 1
DHCP4.OPTION[20]: requested_subnet_mask = 1
DHCP4.OPTION[21]: requested_time_offset = 1
DHCP4.OPTION[22]: requested_wpad = 1
DHCP4.OPTION[23]: routers = 192.168.1.254
DHCP4.OPTION[24]: subnet_mask = 255.255.255.0
IP6.ADDRESS[1]: 2600:1700:67b2:36a0::47/128
IP6.ADDRESS[2]: 2600:1700:67b2:36a0:a903:bdb7:a9e5:ab4/64
IP6.ADDRESS[3]: fd2d:9091:5573:1:a903:bdb7:a9e5:ab4/64
IP6.ADDRESS[4]: 2600:1700:67b2:36a0:2f20:5b7d:8e25:350b/64
IP6.ADDRESS[5]: fd2d:9091:5573:1:5a74:a87b:36cd:ca46/64
IP6.ADDRESS[6]: fe80::51fa:9873:3a0d:92e9/64
IP6.GATEWAY: fe80::8a96:4eff:fe19:63b0
IP6.ROUTE[1]: dst = fd2d:9091:5573:1::/64, nh = ::, mt = 100
IP6.ROUTE[2]: dst = 2600:1700:67b2:36a0::/60, nh = fe80::8a96:4eff:fe19:63b0, mt = 100
IP6.ROUTE[3]: dst = 2600:1700:67b2:36a0::/64, nh = ::, mt = 100
IP6.ROUTE[4]: dst = ::/0, nh = fe80::8a96:4eff:fe19:63b0, mt = 20100
IP6.ROUTE[5]: dst = 2600:1700:67b2:36a0::47/128, nh = ::, mt = 100
IP6.ROUTE[6]: dst = fe80::/64, nh = ::, mt = 100
IP6.ROUTE[7]: dst = ff00::/8, nh = ::, mt = 256, table=255
IP6.DNS[1]: 2600:1700:67b2:36a0::1
DHCP6.OPTION[1]: dhcp6_domain_search = attlocal.net
DHCP6.OPTION[2]: dhcp6_name_servers = 2600:1700:67b2:36a0::1
DHCP6.OPTION[3]: ip6_address = 2600:1700:67b2:36a0::47
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: /org/freedesktop/NetworkManager/Settings/1
CONNECTIONS.AVAILABLE-CONNECTIONS[1]: 6ab51d0b-c1ad-3105-9293-afaab89a26d1 | Wired connection 1
##### NetworkManager.state ##############
cat: /var/lib/NetworkManager/NetworkManager.state: Permission denied
##### NetworkManager config #############
[[/etc/NetworkManager/conf.d/default-wifi-powersave-on.conf]]
[connection]
wifi.powersave = 3
[[/etc/NetworkManager/NetworkManager.conf]]
[main]
plugins=ifupdown,keyfile
[ifupdown]
managed=false
[device]
wifi.scan-rand-mac-address=no
[[/usr/lib/NetworkManager/conf.d/10-dns-resolved.conf]]
[main]
dns=systemd-resolved
[[/usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf]]
[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma
[[/usr/lib/NetworkManager/conf.d/20-connectivity-ubuntu.conf]]
[connectivity]
uri=http://connectivity-check.ubuntu.com/
[[/usr/lib/NetworkManager/conf.d/no-mac-addr-change.conf]]
[device-mac-addr-change-wifi]
match-device=driver:rtl8723bs,driver:rtl8189es,driver:r8188eu,driver:8188eu,driver:eagle_sdio,driver:wl
wifi.scan-rand-mac-address=no
##### NetworkManager profiles ###########
##### Netplan config ####################
[/etc/netplan/01-network-manager-all.yaml]
network:
version: 2
renderer: NetworkManager
##### iw reg get ########################
Region: America/Chicago (based on set time zone)
global
country 00: DFS-UNSET
(2402 - 2472 @ 40), (6, 20), (N/A)
(2457 - 2482 @ 20), (6, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(2474 - 2494 @ 20), (6, 20), (N/A), NO-OFDM, PASSIVE-SCAN
(5170 - 5250 @ 80), (6, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(5250 - 5330 @ 80), (6, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN
(5490 - 5730 @ 160), (6, 20), (0 ms), DFS, PASSIVE-SCAN
(5735 - 5835 @ 80), (6, 20), (N/A), PASSIVE-SCAN
(57240 - 63720 @ 2160), (N/A, 0), (N/A)
##### iwlist channels ###################
enp4s0 no frequency information.
lo no frequency information.
##### iwlist scan #######################
enp4s0 Interface doesn't support scanning.
lo Interface doesn't support scanning.
##### module infos ######################
##### module parameters #################
##### /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/rtl8188fu.conf]
options rtl8188fu rtw_power_mgnt=0 rtw_enusbss=0
##### rc.local ##########################
grep: /etc/rc.local: No such file or directory
##### pm-utils ##########################
##### udev rules ########################
##### dmesg #############################
########## wireless info END ############
感谢您的帮助。
答案1
欢迎来到 Ask Ubuntu！
连接以太网后，请打开终端（Ctrl+Alt+t）并执行以下操作：
sudo apt update
sudo apt install build-essential git dkms
git clone https://github.com/aircrack-ng/rtl8812au.git
cd rtl8812au/
sudo make dkms_install
断开以太网并重新启动。您可能需要在 EFI/BIOS 中禁用安全启动。
你的无线网络现在应该可以正常工作了。