I had an issue with my laptop in which whenever used Ubuntu connected to wifi, every other device on the same connection would slow to an unusable place. I researched and found someone else had this issue, and the solution there was to run the following:
sudo sh -c "echo 'blacklist wl' >> /etc/modprobe.d/broadcomm-blacklist.conf sudo sh -c "echo 'brcmsmac' >> /etc/modprobe.d/broadcomm.conf
Being dumb, I did that without fully understanding the consequences/what I was doing, and now my laptop cannot detect wifi connections at all. I suppose I have disabled my driver, though I have no idea how to get it working again.
After the fact, I noticed someone in the comments of the post I mention above warns against this very thing happening --> my fault! Any help is appreciated.