首先，當我使用 Ubuntu 20.04 時，我試圖解決這個問題（沒有運氣），看這裡ubuntu 20.04 的 wifi 速度很慢，我只得到 20Mbps 應該得到 300Mbps
正如你在20.04 看到的那樣，我的wifi 速度很慢，我試圖解決它，但沒有成功，所以我想希望22.04 能夠解決wifi 速度慢的問題，無論如何，這就是我的希望，但我在22.04 上，且無線網路仍然很慢。而且只是下載速度慢，上傳速度還好。下載速度應該是 300Mbps 左右，但我得到了 30Mbps 左右。哦，還有一件事，透過有線連接，我的下載速度約為 500Mbps，所以有線連接完全沒問題，是我的 wifi 有問題。
就我個人而言，我認為 wifi 驅動程式很糟糕，這就是我的想法。我希望能在askubuntu 上解決這個問題，如果我不能解決這個問題，那麼我將把這個問題作為一個錯誤報告給Canonical。但希望這不是一個錯誤，你們中的一個人可以幫助我一勞永逸地解決這個問題。
這是的輸出lspci
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] RS780 Host Bridge
00:02.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] RS780 PCI to PCI bridge (ext gfx port 0)
00:04.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] RS780/RS880 PCI to PCI bridge (PCIE port 0)
00:07.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] RS780/RS880 PCI to PCI bridge (PCIE port 3)
00:0a.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] RS780/RS880 PCI to PCI bridge (PCIE port 5)
00:11.0 SATA controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 SATA Controller [IDE mode]
00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:12.1 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0 USB OHCI1 Controller
00:12.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:13.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:13.1 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0 USB OHCI1 Controller
00:13.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 SMBus Controller (rev 3c)
00:14.1 IDE interface: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 IDE Controller
00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 Azalia (Intel HDA)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 LPC host controller
00:14.4 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 PCI to PCI Bridge
00:14.5 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI2 Controller
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 5
01:00.0 VGA compatible controller: NVIDIA Corporation GM107 [GeForce GTX 750 Ti] (rev a2)
01:00.1 Audio device: NVIDIA Corporation GM107 High Definition Audio Controller [GeForce 940MX] (rev a1)
02:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8192CE PCIe Wireless Network Adapter (rev 01)
03:00.0 USB controller: ASMedia Technology Inc. ASM1042A USB 3.0 Host Controller
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 09)
這是我輸入終端命令時的輸出nmcli device wifi list
IN-USE BSSID SSID MODE CHAN RATE SIGNAL BARS SECURITY
* XXXXXXXXXXXXXXXXX ARRIS-15D1 Infra 8 270 Mbit/s 94 ▂▄▆█ WPA2
XXXXXXXXXXXXXXXXX -- Infra 11 260 Mbit/s 89 ▂▄▆█ WPA2
XXXXXXXXXXXXXXXXX Kavika2019 Infra 11 260 Mbit/s 87 ▂▄▆█ WPA2
XXXXXXXXXXXXXXXXX -- Infra 11 260 Mbit/s 87 ▂▄▆█ WPA2
XXXXXXXXXXXXXXXXX -- Infra 11 260 Mbit/s 87 ▂▄▆█ WPA2 802.1X
XXXXXXXXXXXXXXXXX -- Infra 6 130 Mbit/s 79 ▂▄▆_ WPA2
XXXXXXXXXXXXXXXXX -- Infra 1 195 Mbit/s 77 ▂▄▆_ WPA1 WPA2
XXXXXXXXXXXXXXXXX -- Infra 6 130 Mbit/s 77 ▂▄▆_ WPA2
XXXXXXXXXXXXXXXXX -- Infra 6 130 Mbit/s 77 ▂▄▆_ WPA1 WPA2 802.1X
XXXXXXXXXXXXXXXXX carlos Infra 11 195 Mbit/s 62 ▂▄▆_ WPA2
XXXXXXXXXXXXXXXXX -- Infra 11 195 Mbit/s 62 ▂▄▆_ WPA1 WPA2
XXXXXXXXXXXXXXXXX -- Infra 11 195 Mbit/s 62 ▂▄▆_ WPA1 WPA2 802.1X
XXXXXXXXXXXXXXXXX -- Infra 1 195 Mbit/s 57 ▂▄▆_ WPA1 WPA2 802.1X
XXXXXXXXXXXXXXXXX HOME-7A55-2.4 Infra 1 195 Mbit/s 57 ▂▄▆_ WPA1 WPA2
XXXXXXXXXXXXXXXXX -- Infra 1 195 Mbit/s 57 ▂▄▆_ WPA1 WPA2
XXXXXXXXXXXXXXXXX Daxs House Infra 11 195 Mbit/s 57 ▂▄▆_ WPA2
XXXXXXXXXXXXXXXXX -- Infra 11 195 Mbit/s 57 ▂▄▆_ WPA1 WPA2 802.1X
XXXXXXXXXXXXXXXXX -- Infra 11 260 Mbit/s 54 ▂▄__ WPA2 802.1X
XXXXXXXXXXXXXXXXX Pumpkin Infra 11 260 Mbit/s 52 ▂▄__ WPA2
XXXXXXXXXXXXXXXXX -- Infra 11 260 Mbit/s 52 ▂▄__ WPA2
XXXXXXXXXXXXXXXXX -- Infra 11 260 Mbit/s 52 ▂▄__ WPA2
XXXXXXXXXXXXXXXXX -- Infra 11 260 Mbit/s 49 ▂▄__ WPA2
XXXXXXXXXXXXXXXXX HP-Print-E2-Officejet Pro 8600 Infra 6 54 Mbit/s 47 ▂▄__ WPA2
XXXXXXXXXXXXXXXXX Cfyuuy6fff Infra 11 260 Mbit/s 47 ▂▄__ WPA2
XXXXXXXXXXXXXXXXX -- Infra 10 270 Mbit/s 40 ▂▄__ WPA2
XXXXXXXXXXXXXXXXX HOME-EC92 Infra 11 270 Mbit/s 40 ▂▄__ WPA1 WPA2
輸入命令時的輸出ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp4s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000
link/ether XX:XX:XX:XX:XX:XX brd ff:ff:ff:ff:ff:ff
3: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DORMANT group default qlen 1000
link/ether XX:XX:XX:XX:XX brd ff:ff:ff:ff:ff:ff
輸入終端命令時的輸出iwconfig
lo no wireless extensions.
enp4s0 no wireless extensions.
wlp2s0 IEEE 802.11 ESSID:"ARRIS-15D1"
Mode:Managed Frequency:2.447 GHz Access Point: XX:XX:XX:XX:XX:XX
Bit Rate=144.4 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Power Management:on
Link Quality=66/70 Signal level=-44 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:102 Missed beacon:0
編輯：
的輸出lspci -nnk | grep 0280 -A3
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8192CE PCIe Wireless Network Adapter [10ec:8178] (rev 01)
Subsystem: ASUSTeK Computer Inc. RTL8192CE PCIe Wireless Network Adapter [1043:85e3]
Kernel driver in use: rtl8192ce
Kernel modules: rtl8192ce
輸出iwlist wlp2s0 freq
wlp2s0 11 channels in total; available frequencies :
Channel 01 : 2.412 GHz
Channel 02 : 2.417 GHz
Channel 03 : 2.422 GHz
Channel 04 : 2.427 GHz
Channel 05 : 2.432 GHz
Channel 06 : 2.437 GHz
Channel 07 : 2.442 GHz
Channel 08 : 2.447 GHz
Channel 09 : 2.452 GHz
Channel 10 : 2.457 GHz
Channel 11 : 2.462 GHz
Current Frequency:2.447 GHz (Channel 8)
編輯：
那麼連結速度到底意味著什麼呢？為什麼是144Mbps？我以為我的 wifi 路由器能夠達到 300Mbps。謝謝。
答案1
首先，我完全不同意您在其他問題中給出的在路由器中使用通道 8 的建議。頻道 8 是一個重疊通道。請參閱：https://www.metageek.com/training/resources/why-channels-1-6-11/根據您所在位置的頻道密度，我推薦頻道 1。
接下來，您應該考慮一些故障排除步驟。檢查路由器中的設定。首選WPA2-AES；不是任何 WPA 和 WPA2 混合模式，當然也不是 TKIP。其次，如果您的路由器支援 N 種速度，那麼您可能會在 2.4 GHz 頻段中使用 20 MHz 通道寬度而不是自動 20/40 MHz 獲得更好的連線。我建議使用固定頻道（1、6 或 11），而不是自動頻道選擇。另外，請確保路由器未設定為僅使用 N 速度；優選自動B、G和N。進行這些變更後，重新啟動路由器。
請檢查無線卡的天線連接器。兩者都牢固地卡入到位嗎？
通常，筆記型電腦底部有一個小門，您可以透過它看到無線網卡。
最後，rtl8192ce 裝置不支援 5 GHz 操作，而這通常是最快的方法。請在此處查看完整的設備詳細資訊：https://device.report/wifi/WFA8643
您當然可以考慮使用支援 5 GHz 的 USB 無線裝置來取代內部裝置。