I have just installed Ubuntu 12.04 on my laptop. Before, on Natty (11.04), I had ~650kbs. Now I am down to ~30kbs. This makes using my computer almost impossible as I try to set up a new system.
I have removed bcmwl-kernel-source and replaced it with firmware-b43-lpphy-installer to no avail. I also tried the steps here.
I don't know what outputs/commands would be useful for you to have. I use a 64bit OS on an Inspiron 1545. Sound is also no functional. Please fill me in.