Ubuntu 11.04 & 11.10 64bits: install and configure drivers for Canon MP540 printer

Install drivers:
sudo add-apt-repository ppa:michael-gruz/canon
sudo apt-get update
sudo apt-get install cnijfilter-mp540series

Edit configuration file:
sudo emacs /usr/share/cups/model/cnmp540.ppd

REPLACE:
*OpenUI *CNQuality/Quality: PickOne
*OrderDependency: 0 AnySetup *CNQuality
*DefaultCNQuality: 3
*CNQuality 2/High: "2"
*CNQuality 3/Standard: "3"
*CNQuality 4/Fast: "4"
*CloseUI: *CNQuality

BY:
*OpenUI *CNQuality/Quality: PickOne
*OrderDependency: 0 AnySetup *CNQuality
*DefaultCNQuality: 3
*CNQuality 2/High: "2"
*CNQuality 3/Standard: "3"
*CNQuality 4/Fast: "4"
*CNQuality 5/Economy: "5"
*CloseUI: *CNQuality

REPLACE:
*OpenUI *CNGrayscale/Grayscale: Boolean
*OrderDependency: 0 AnySetup *CNGrayscale
*DefaultCNGrayscale: False
*CNGrayscale False/No: " "
*CNGrayscale True/Yes: " "
*CloseUI: *CNGrayscale

BY:
*OpenUI *CNGrayscale/Grayscale: PickOne
*DefaultCNGrayscale: false
*CNGrayscale false/Off: "false"
*CNGrayscale true/On: "true"
*CloseUI: *CNGrayscale

Add a printer:
use the printer configuration tool and provide the path to the PPD file when required.