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我在 Lenovo G50-30 上启用 wifi 时遇到问题 以下是命令输出，请帮帮我

lspci | grep -i wireless：

02:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter

nm-tool：

NetworkManager Tool

State: disconnected

- Device: eth0 
  Type:              Wired
  Driver:            r8169
  State:             unavailable
  Default:           no
  HW Address:        28:D2:44:81:36:0B

  Capabilities:
    Carrier Detect:  yes

  Wired Properties
    Carrier:         off


- Device: wlan0
  Type:              802.11 WiFi
  Driver:            rtl8723be
  State:             unavailable
  Default:           no
  HW Address:        14:2D:27:21:8D:47

  Capabilities:

  Wireless Properties
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes …