我希望我没有重复做任何事，但我已经尝试了好几个小时来解决这个问题，但没有任何效果。今天早上我的 wifi 连接工作正常，然后我安装了 Ubuntu 的最新更新，当我重新启动笔记本电脑时，wifi 无法工作。我想指出的是，wifi 网络被检测到，但信号很弱，导致我的笔记本电脑无法连接。以下是一些信息
$ lspci | grep Network
04:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01)
lsusb
Bus 002 Device 002: ID 8087:8000 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID 04f2:b3fd Chicony Electronics Co., Ltd
Bus 003 Device 002: ID 13d3:3402 IMC Networks
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
$ sudo lshw -class network
*-network
description: Interface réseau sans fil
product: AR9485 Wireless Network Adapter
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:04:00.0
logical name: wlan0
version: 01
serial number: 40:e2:30:d2:c9:fd
bits: 64 bits
clock: 33MHz
fonctionnality: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
configuration: broadcast=yes driver=ath9k driverversion=4.15.0-45-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11
ressources: irq:18 mémoire:f7900000-f797ffff mémoire:f7980000-f798ffff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0.1
bus info: pci@0000:05:00.1
logical name: eth0
version: 12
serial: 08:62:66:b6:70:0e
size: 10Mbit/s
capacity: 1Gbit/s
bits: 64 bits
clock: 33MHz
fonctionnality: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8411-2_0.0.1 07/08/13 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:19 portE/S:d000(taille=256) mémoire:f7814000-f7814fff mémoire:f7810000-f7813fff
$ iwconfig
eth0 no wireless extensions.
lo no wireless extensions.
wlan0 IEEE 802.11 ESSID:"freebox_JTIXDN"
Mode:Managed Frequency:2.462 GHz Access Point: 00:24:D4:D1:3B:04
Bit Rate=2 Mb/s Tx-Power=15 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=38/70 Signal level=-72 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:88 Invalid misc:449 Missed beacon:0
$ rfkill list all
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
如果您需要更多信息，请告诉我！我真的很绝望……
非常感谢