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I have a HP Pavilion Laptop. The details of which, obtained by running the command lshw, are below:

product: HP Pavilion Notebook (N1J39EA#A2N)
    vendor: Hewlett-Packard
    version: Type1ProductConfigId
    serial: 5CD5291DWT
    width: 64 bits
    capabilities: smbios-2.8 dmi-2.8 smp vsyscall32

I switched from windows to Ubuntu 18.04 very recently. Initially I did face wifi weak signal issue. However, I fixed the issue by using the following commands:

sudo modprobe -rv rtl8723be
sudo modprobe -v rtl8723be ant_sel=2
sudo ip link set wlo1 up
sudo iw dev wlo1 scan
echo "options rtl8723be ant_sel=2" | sudo tee /etc/modprobe.d/rtl8723be.conf

Everything was working perfectly and then 2 days ago I updated my system and thereby the kernel got updated which in turn brought back wifi issue.

I tried to fix wifi issue by using the same old method but failed to do so. I also tried the following:

sudo tee /etc/modprobe.d/rtl8723be.conf <<< "options rtl8723be ant_sel=1"

which also couldn't solve the issue. Then I went on to try the following:

sudo -i
echo "options rtl8723be ant_sel=2"  >  /etc/modprobe.d/rtl8723be.conf
exit
reboot

the same result with same problem. output of the command

lspci -knn | grep Net -A3; rfkill list

is as follows:

08:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
    Subsystem: Hewlett-Packard Company RTL8723BE PCIe Wireless Network Adapter [103c:804c]
    Kernel driver in use: rtl8723be
    Kernel modules: rtl8723be
09:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [10ec:8136] (rev 0a)
0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: hci0: Bluetooth
    Soft blocked: yes
    Hard blocked: no

References:

Weak Signal

inconsistent connection

weak signal and disconnection

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