that is great for you. many others use webmin and if it solves your problem it is not overkill. It is just a simple way to do things. I often use it because it is faster and easier to guide a person thru that than it is to guide them thru the terminal commands. Or sometimes I just think that the graphical interface is faster and less trouble than command line but that is what linux is about. Do it your way.
No insult intended. I have no objections to anyone installing Webmin or any other application they want. I was not trying to disparage your idea.
Webmin does many different Linux administration functions. It can be confusing for some people, especially beginners. Furthermore, it requires a web server, which may not be necessary on the desktop machine shown in the images.
I questioned whether installing and configuring Webmin would be the best solution for the OP. Behind that question, I wondered whether Webmin installation and configuration might be a challenge for the OP. (In addition, it is not obvious to me that Webmin will definitely fix the network issue, although I did not say that openly. Let us assume that it will.)
You said that installing and using Webmin is the easiest way to fix the OP's problem. I can see that you like and use Webmin a lot. You and many others use and recommend it.
I question whether it will be so easy for the OP. I had hoped that others would offer alternative suggestions to give the OP some options. That's it. Webmin is on the table now. Let's see if there are any other reasonable suggestions.