Qualcomm Atheros weak Wifi signal on Ubuntu 18.04

Suggest, after you do

sudo modprobe -rv ath10k_pci   

to try

sudo modprobe -v ath10k_pci ant_sel=2

as it might be an RF issue which Windows resolved by using antenna #2.

Run in terminal

sudo tee /etc/modprobe.d/rtl8723be.conf <<< "options rtl8723be ant_sel=2"

This will create a config file to make the setting permanent. Then restart.

For all other Qualcomm cards...

check this command lspci | grep 'Network'

if output comes as

02:00.0 Network controller: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter (rev 31)

Then this solution may work for you

sudo apt-get update
sudo apt-get install linux-headers-generic build-essential
wget https://www.kernel.org/pub/linux/kernel/projects/backports/2015/11/20/backports-20151120.tar.gz
tar -zxvf backports-20151120.tar.gz
cd backports-20151120
make defconfig-ath10k
make
sudo make install

ignore if you get any errors or warnings for make