Unfortunately, I don't have a Brother printer, so all I can do is parrot what I can find (or what you could find yourself) using Google. It is extremely important to follow command line stuff exactly or you don't stand a chance of success. From what I can find on the Brother website, the script should install your driver. Be sure your printer is turned on! It might help if it is connected to your computer with a USB cable or if it is already connected to your home router.
We have some difficulty expressing to each other what is being done, or trying to be done. For instance, you don't "install a bash thingy"... you run or execute a BASH command or script. And "no go" is not the error that Linux uses to report a failure.
I understand at this point that you have downloaded the script and unzipped it into your Downloads folder.
Open a terminal and let's try to step through it. What I'm telling you below may look a little different if you aren't using Linux Mint, which is what I'm using, but hopefully you will follow along.
Your terminal prompt will be something like, username@computername ~ ?
Type "sudo su" (without quotation marks) and hit ENTER. You will be prompted to enter your root password, and hit ENTER again when you have typed it in. The ? symbol should change to a # symbol, and change to something like: computername username #
If you see the # prompt I just described, then type: cd /home/your-username/Downloads and hit ENTER. Your prompt should look like: comptername Downloads #
On Linux Mint, it will look like as I just described. Downloads must have a capital letter "D". Other versions of Linux may be different. Maybe that is the trouble you had.
If you 're in the proper Downloads folder, where your script is, then your ready to execute it now as root. So type: bash linux-brprinter-installer-2.0.0-1 MFC-L2700DW (ENTER) -- and if that doesn't work, try: bash ./linux-brprinter-installer-2.0.0-1 MFC-L2700DW (ENTER)
(TIP: Click and drag your mouse to highlight the command you want to use, hit CNTL-C to copy it, and then in the Terminal window, use the middle-click to paste it. Sometimes a scroll wheel on the mouse works as middle-click if you push down on it.)
With any luck, it will now run and fetch your driver (yes, be connected to the Internet at this point too). The script is not the driver itself, but I'm expecting it to download it and install it for you. This may all take a little while to complete.
If it doesn't work, then please describe the errors you get. And please be as EXACT as you possibly can. I have found another page that describes installing the drivers for your printer manually, but I think that will be even harder than using the script.
Cheers!