I have a Brother HL-2240 monochrome laser printer that does the bulk of my home printing. Trying to be clever and install the official Brother drivers wasn't working. It was working with my Thinkpad running Ubuntu Raring Ringtail (12.04), so I checked to see what driver was installed. Apparently I had installed HPLIP for a wireless all-in-one inkjet. The working driver was for a Brother HL-2170W; not the recommended driver, but the HPijs-Pcl-5e driver. I had to install the HPijs driver package (used Ubuntu Software Center), restart and then manually choose the HPijs-Pcl-5e driver.