我有一台 HP 笔记本电脑，装有 Ubuntu 20.04.4，内核版本：5.15.0-46-generic。通常我在家里使用路由器的 5G 信道，它工作正常。但是当我使用 2.4G 时，它无法连接或信号很差，尽管它在其他设备上表现良好。我在办公室只能使用 2.4G，所以我别无选择。
wlist chan
no frequency information.
eno1 no frequency information.
wlo1 32 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
Channel 36 : 5.18 GHz
Channel 40 : 5.2 GHz
Channel 44 : 5.22 GHz
Channel 48 : 5.24 GHz
Channel 52 : 5.26 GHz
Channel 56 : 5.28 GHz
Channel 60 : 5.3 GHz
Channel 64 : 5.32 GHz
Channel 100 : 5.5 GHz
Channel 104 : 5.52 GHz
Channel 108 : 5.54 GHz
Channel 112 : 5.56 GHz
Channel 116 : 5.58 GHz
Channel 120 : 5.6 GHz
Channel 124 : 5.62 GHz
Channel 128 : 5.64 GHz
Channel 132 : 5.66 GHz
Channel 136 : 5.68 GHz
Channel 140 : 5.7 GHz
Channel 144 : 5.72 GHz
Channel 149 : 5.745 GHz
Current Frequency=5.765 GHz
sudo lshw -C network
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
logical name: eno1
version: 15
serial: 10:62:e5:c9:3e:94
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=5.15.0-46-generic firmware=rtl8168h-2_0.0.2 02/26/15 latency=0 link=no multicast=yes port=twisted pair
resources: irq:16 ioport:4000(size=256) memory:a4104000-a4104fff memory:a4100000-a4103fff
*-network
description: Wireless interface
product: RTL8821CE 802.11ac PCIe Wireless Network Adapter
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlo1
version: 00
serial: 74:40:bb:31:83:ab
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rtw_8821ce driverversion=5.15.0-46-generic firmware=N/A ip=192.168.0.102 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:131 ioport:3000(size=256) memory:a4000000-a400ffff
nmcli device wifi list
IN-USE BSSID SSID MODE CHAN RATE SIGNAL BARS SECURITY
XX:XX:XX:XX:XX:XX Dip-Home 5G Infra 153 135 Mbit/s 70 ▂▄▆_ WPA2
* XX:XX:XX:XX:XX:XX Dip-Home Infra 9 270 Mbit/s 54 ▂▄__ WPA2
这里，“Dip-Home”是2.4G连接，“Dip-Home 5G”是同一路由器的5G连接。“Dip-Home 5G”工作正常，系统每次都尝试按默认优先级连接它。所以我从wifi设置中忘记了“Dip-Home 5G”的连接，这样它就无法优先连接它。然后尝试连接2.4G的“Dip Home”。这个连接很慢，虽然我就在路由器前面。同样的事情到处都在发生。
有人可以提出一些解决方法吗？
答案1
安装rtl8821ce-dkms附加驱动程序或运行：
sudo apt install rtl8821ce-dkms
然后重新启动。