I am using Ubuntu 16.04 and the wireless card RTL8723BE.
I have tried three laptops now, the Lenovo B50-45, Lenovo B50-50 and HP 350 G2. They all have the wireless card RTL8723BE integrated and they all had the same issue - the wlan frequently disconnects and after disconnection I cannot connect again. Sometimes I do not even find any other router where I could connect to. The only solution that I found was to make a restart.
I am aware of the question How do I get a Realtek RTL8723BE wireless card to work? and I followed the instruction of the answer, installing a new driver. However, on all three laptops this did not solve the problem. I also tried as suggested to add
echo "options rtl8723be ant_sel=2" | sudo tee /etc/modprobe.d/rtl8723be.conf
but this also did not help. Even worse, when adding this line I could not even connect normally to the router, so I had to remove it again.
I also had Windows 10 on the HP laptop and on Windows 10 there were no connection errors. So I don't think that the router is the problem.
Here is the information about my current installed wireless card:
*-network description: Wireless interface product: RTL8723BE PCIe Wireless Network Adapter vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info: pci@0000:02:00.0 logical name: wlp2s0 version: 00 serial: 68:14:01:30:e1:33 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=rtl8723be driverversion=4.4.0-45-generic firmware=N/A ip=192.168.1.102 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn resources: irq:17 ioport:5000(size=256) memory:d3100000-d3103fff
What else could I try to get this wireless card working?