我无法通过Ubuntu连接到无线连接。我尝试运行sudo apt-get install --reinstall bcmwl-kernel-source，然后重新启动了笔记本电脑，但没有用。
我还参考了this video中的说明。还是没用。
lspci的输出如下：
00:00.0 Host bridge: Intel Corporation Device 3ec4 (rev 07)
00:01.0 PCI bridge: Intel Corporation Skylake PCIe Controller (x16) (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Device 3e9b
00:04.0 Signal processing controller: Intel Corporation Skylake Processor Thermal Subsystem (rev 07)
00:08.0 System peripheral: Intel Corporation Skylake Gaussian Mixture Model
00:12.0 Signal processing controller: Intel Corporation Device a379 (rev 10)
00:14.0 USB controller: Intel Corporation Device a36d (rev 10)
00:14.2 RAM memory: Intel Corporation Device a36f (rev 10)
00:15.0 Serial bus controller [0c80]: Intel Corporation Device a368 (rev 10)
00:15.1 Serial bus controller [0c80]: Intel Corporation Device a369 (rev 10)
00:16.0 Communication controller: Intel Corporation Device a360 (rev 10)
00:17.0 SATA controller: Intel Corporation Device a353 (rev 10)
00:1b.0 PCI bridge: Intel Corporation Device a32c (rev f0)
00:1d.0 PCI bridge: Intel Corporation Device a334 (rev f0)
00:1d.5 PCI bridge: Intel Corporation Device a335 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Device a30d (rev 10)
00:1f.3 Audio device: Intel Corporation Device a348 (rev 10)
00:1f.4 SMBus: Intel Corporation Device a323 (rev 10)
00:1f.5 Serial bus controller [0c80]: Intel Corporation Device a324 (rev 10)
01:00.0 VGA compatible controller: NVIDIA Corporation Device 2191 (rev a1)
01:00.1 Audio device: NVIDIA Corporation Device 1aeb (rev a1)
01:00.2 USB controller: NVIDIA Corporation Device 1aec (rev a1)
01:00.3 Serial bus controller [0c80]: NVIDIA Corporation Device 1aed (rev a1)
06:00.0 Non-Volatile memory controller: Sandisk Corp Device 5002
07:00.0 Ethernet controller: Qualcomm Atheros Killer E2500 Gigabit Ethernet Controller (rev 10)
08:00.0 Network controller: Intel Corporation Device 2723 (rev 1a)
rfkill list的输出如下：
0: acer-wireless: Wireless LAN
Soft blocked: no
Hard blocked: no
1: acer-bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
nmcli general status的输出如下：
STATE CONNECTIVITY WIFI-HW WIFI WWAN-HW WWAN
connected full enabled enabled enabled enabled