cant get wifi to work with rtl8723be

i've spent a while geting a persistent version of Kali on a USB stick and now can not seem to get the wifi to work on myhp stream 13 with rtl8723be wifi driver.

i have used a few version of Linux (though still very much a novice) and have always succeeded in getting the wifi to work using the solution found here:
http://askubuntu.com/questions/63562...s-card-to-work

howver on kali i think something is different with PPA repositorys than the other Linux OS's and i seem to get an error with the first line

Traceback (most recent call last):
File "/usr/bin/add-apt-repository", line 95, in <module>
sp = SoftwareProperties(options=options)
File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 109, in __init__
self.reload_sourceslist()
File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 599, in reload_sourceslist
self.distro.get_sources(self.sourceslist)
File "/usr/lib/python3/dist-packages/aptsources/distro.py", line 89, in get_sources
(self.id, self.codename))
aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template for Kali/kali-rolling

This thread never got an answer
https://forums.kali.org/showthread.p...utput-attached

I cant seem to follow this thread and not sure if it still current
https://forums.kali.org/showthread.p...allation/page2

i have tried other fixes but dont have the links to hand

Can anyone point me in the direction of a fix please or know of a way to remove any changes i may have made and get the wifi working

thanks in advance