找不到 ubuntu 18.04 的 wifi 适配器？

我已经尝试了来自谷歌的所有可能的解决方案，但似乎都没有奏效。这是输出sudo lshw -class network

  *-network                 
   description: Ethernet interface
   product: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller
   vendor: Realtek Semiconductor Co., Ltd.
   physical id: 0
   bus info: pci@0000:01:00.0
   logical name: enp1s0
   version: 07
   serial: 30:e1:71:8b:5a:81
   size: 10Mbit/s
   capacity: 100Mbit/s
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
   configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8106e-1_0.0.1 06/29/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
   resources: irq:16 ioport:4000(size=256) memory:b1200000-b1200fff memory:b1000000-b1003fff

*-network UNCLAIMED
   description: Network controller
   product: RTL8723BE PCIe Wireless Network Adapter
   vendor: Realtek Semiconductor Co., Ltd.
   physical id: 0
   bus info: pci@0000:02:00.0
   version: 00
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress cap_list
   configuration: latency=0
   resources: ioport:3000(size=256) memory:b1100000-b1103fff

*-network
   description: Ethernet interface
   physical id: 3
   logical name: enp0s20f0u3
   serial: 2e:ec:f6:48:14:63
   capabilities: ethernet physical
   configuration: broadcast=yes driver=rndis_host driverversion=22-Aug-2005 firmware=RNDIS device ip=192.168.42.241 link=yes multicast=yes

$ dkms status
bcmwl, 6.30.223.271+bdcom, 4.15.0-34-generic, x86_64: installed
rtl8723de, 5.1.1.8_21285.20171026_COEX20170111-1414: added 
rtlwifi-new, 0.6, 4.15.0-34-generic, x86_64: installed