我已经在带有 RTL8723BE Wi-fi 卡的笔记本电脑上安装了 Ubuntu 15.04。但它总是与网络断开连接。我试过了，echo "options rtl8723be fwlps=N ips=N" | sudo tee /etc/modprobe.d/rtl8723be.conf但这没有帮助。我该怎么做才能防止wifi断开连接？如果我升级到内核 4.X，会有帮助吗？
~$ lspci -knn | grep Net -A2
09:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
Subsystem: Hewlett-Packard Company Device [103c:2231]
Kernel driver in use: rtl8723be
~$ rfkill list
0: hci0: Bluetooth
Soft blocked: yes
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
~$ ifconfig && iwconfig && route -n && ping -c …