Have you checked in the repos using Synaptic as I believe there are Brother drivers ready to install?
Do a Reload when Synaptic is first opened as that will refresh all the apps for you.
Welcome to the forum as well.
I've reloaded the repos, and then checked what was there. It's showing the drivers as being there, after telling them to remove them and applying, it doesn't shoew them as being available any more. I can only assume that it registered them as being there because I had tried to install them directly.
Searching the repos for "Brother" only brings up limited choices.. no of which are MFC's.
Also, I don't see the MFC as a choice in the network, ads I'm trying to install it as a wireless unit.
Seems like everything after the Fail to stat error is being at least partially ignored somehow.
Any other suggestions?