Fix wifi signal very weak or not working on some wireless driver

fix_weak_wifi.md

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Get network drive name

$ inxi -n

Unload the module and try the first parameter option

$ sudo modprobe -r rtl8723be
$ sudo modprobe rtl8723be ant_sel=1
$ iwlist scan | egrep -i 'ssid|quality'

The results from the scan may be the same as original or better but we will check the last option for ant_sel

$ sudo modprobe -r rtl8723be
$ sudo modprobe rtl8723be ant_sel=2
$ iwlist scan | egrep -i 'ssid|quality'

if ant_sel=1 was the best then do

$ echo "options rtl8723be ant_sel=1" | sudo tee /etc/modprobe.d/rtl8723-ant-sel.conf

else

$ echo "options rtl8723be ant_sel=2" | sudo tee /etc/modprobe.d/rtl8723-ant-sel.conf