我已经成功安装了 Ubuntu 16.04 LTS。但是，当我启动系统时，我找不到任何无线连接
我试过了rfkill list并且显示：
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
sudo lshw -C network显示：
*-network
description: Ethernet interface
product: Ethernet Connection I218-LM
vendor: Intel Corporation
physical id: 19
bus info: pci@0000:00:19.0
logical name: enp0s25
version: 04
serial: a0:d3:c1:9c:37:47
size: 100Mbit/s
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=0.3-4 ip=192.168.2.129 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
resources: irq:46 memory:d0700000-d071ffff memory:d073e000-d073efff ioport:3080(size=32)
*-network UNCLAIMED
description: Network controller
product: BCM43228 802.11a/b/g/n
vendor: Broadcom Inc. and subsidiaries
physical id: 0
bus info: pci@0000:02:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: latency=0
resources: memory:d0500000-d0503fff
这是我尝试过的方法：我已运行sudo apt-get update并进入“软件和更新”->“附加驱动程序”，我选择了 Broadcom 驱动程序。我启动了系统，但似乎什么都不起作用。我该怎么办？