I'm afraid the excellent and lengthy posts in Installing Broadcom Wireless Drivers are not solving my problem. I have installed Ubuntu 20.04 on an mid 2007 24" iMac. But I'm a complete Ubuntu newbie. I'll try to make it as clear as possible what I tried and give you the info I have about the hardware.
So first of all: I have a Wifi connection but it's very poor. My iMac is on exactly the same spot where it was before and it had a full strength wifi signal. Now it has only half the strength and it drops out every other minute. I also have the impression that it influences the quality of the signal to my other devices (although I don't know if such a thing is at all possible). Same problem with the Bluetooth connection which drops out regularly.
My PCI.ID is
[14e4:4328] (rev 03)
which puts me in the bcmwl-kernel-source category, according to the Broadcom Wireless Table in the aforementioned discussion. If I understand correctly, this is the driver that came with Ubuntu and was checked in 'Additional Drivers'. Except it doesn't do the job.
Since it's after September 2014, I also installed the other package firmware-b43-installer after uninstalling bcmwl-kernel-source. To no avail. Then uninstalled that second package and turned back to the first one. Doesn't work.
I edited blacklist.conf to put a hashtag in front of blacklist bcm43xx and a lot of the other stuff suggested on the page. The problem is that I don't really have a way of knowing if I'm doing things in the right order since I'm completely new to Linux.
And yes, i have good intentions to inform myself and learn the basics of Linux. Which is (a.o.) why I need a good working wifi connection.
If somebody would be so kind to 'talk me through' the process, I would be very, very happy. This is my wireless-info output: https://paste.ubuntu.com/p/HF67Z2KWSh/
Many thanks!
Edit 1. I posted some more diagnostic data here: https://paste.ubuntu.com/p/Mt3RjjpQcQ/
Edit 2. Installing the bcmwl-kernel-source package made my wifi stop working altogether. Removing it brought me back to the same situation as before. So nothing solved yet.
