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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.

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up vote 0 down vote accepted

You've added blacklist wl to /etc/modprobe.d/broadcomm-blacklist.conf and brcmsmac to /etc/modprobe.d/broadcomm.conf.

To revert your changes, just remove the lines you've added from the files using sudo nano /etc/modprobe.d/broadcomm-blacklist.conf and sudo nano /etc/modprobe.d/broadcomm.conf.

sudo nano will open a text editor (nano) as su (superuser/admin). Remove the lines you've added (navigate using your cursor keys), and hit CTRL + X, enter, Y and enter again to save.

Also, are you sure it's "broadcomm" and not "broadcom"?

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Thank you! Broadcom is the name of the driver, though "broadcomm" was what the script I'd used said, so that's what I had typed. Anyway, it's working now. – carpark72 Apr 24 '14 at 2:27

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