I have a Canon Pixma MG5520 printer/scanner combo. It works very well with Ubuntu 15.10 when printing in greyscale, and SimpleScan works fine. However, when I print in color, everything becomes darker than it should be. When the exact same document is printed from a Windows laptop, it looks fine.
This is one of the more odd things I have run across with Ubuntu, and if anyone has any ideas, then that would be great!
Best Answer
I had exactly the same problem with 15.10, but with a Canon Pixma MG5250. This is how I came across your question. Apparently the Cups+Gutenprint driver uses wrong default settings. As is also the case for selecting the rear tray for standard paper.
I corrected this as follows:
In System Settings - Printers, right-click the printer icon and select properties.
In the left pane select Printer Options.
Then change the Color Model from RGB Color into CMYK (or CMY if your printer uses only cyan, magenta and yellow cartridges).
Be aware that the application from which you are printing may also have printer settings that may override the printer driver settings. So also there make sure to change RGB into CMYK.