I had CUPS installed, and since I installed LM my printer Canon PIXMA IP4200 didn't work, it was recognized, and installed correctly, but at the moment of sending any page to print, the printer was like "stucked" and it blinked until I had to disconnect it from the electricity.
Now, adding the PPA and the update&&upgrade it finally started printing again!
thanks a lot!
CORRECTION: After printing a couple of test pages, it went back to having the same problem... it keeps hanging and blinking. All jobs that I send weight 0Kb.. it stays like loading the document.