I would like to bump this thread because I'm running into a problem during one of these steps, namely the removal of the module. I run
sudo modprobe -r rtl8723be
and then it just hangs there indefinitely. Not sure what's happening. Any help is greatly appreciated!
I am not yet mac use but after little research I foudn this super answer from @metakermit in the Ubuntu StackExchange, I think that can help you.
Apparently you will also have to install the firmware.
By cons I can not tell you exactly why the wifi works during installation and not after, my skill is not hight but ...
I currently have 2 DELL with Killer wifi card and they have always works with the version of elementary OS 5.0 and 5.1 and with kernel 4.X and the new 5.X ( 5.0.0-37-generic for elementary OS Hera)
I think you did not check the option
install third party software for graphics and wifi hardware and additional media formats during the window Update and other ...
Now we have the wifi card model I can answer you.
It would seem that other people have them problem in Ubuntu 18.04 and elementary OS is based on Ubuntu, currently elementary Hera 5.1 is under version 18.04 of Ubuntu
So you can follow this answer on the Ubuntu StackExchange here
As far as I can tell, at the time of writing this, there is not yet a Wifi ...
So that the Wifi card almost always works do not forget to check the option
Install third-party software for graphics Wi-Fi Hardware and additionalmedia formats
in the window Update and other software during the installation
For your wifi card to work, you must check a case during the installation of Elementary OS (this is very often the case for many LINUX distribution)
Before the installation in the window Update and other software you need check this option :
Install third-party software for graphics Wi-Fi Hardware and additional media formats
It is worth trying the solution described here. The video also shows a way of measuring the speed from Terminal, using speedtest. So, install and run speedtest to see the down/up speed before applying the solution:
sudo apt install speedtest-cli && speedtest
Now, in Terminal paste the following commands, one after the other:
echo "options iwlwifi ...
The first thing I would try, if you have a laptop, is to disable the integrated (and faulty) network adapter from the BIOS.
If the above solution is not applicable, try to temporarily disable the network interface, use it's logical name with ip:
sudo ip link set wlp4s0 down
If this works, to make the change permanent, you'll have to run this command at ...
Click on the network indicador and then click on Network settings (or the closest to this - I'm running eOS in pt_BR). It'll open the network settings screen. Each network device shows a toggle on the top-right. Flipping this toggle will enable/disable the device.