Canon D420 Printer Issue on Ubuntu 11.04

After  installing Ubuntu 11.04Beta, the  Canon D420 printer driver can't be installed because it depends on gs-esp which is not supported in the new environment. So here is an alternative way to install the driver.
Download the driver from here.
Extract it and go to its RPM foder.
Install alien which allows you to install rpm file on Debian/Ubuntu:

sudo apt-get install alien dpkg-dev debhelper build-essential 

Install RPM files (common file first):

sudo alien -k *.rpm
sudo chmod a+x *.deb
sudo dpkg -i cndrvcups-common_2.20-1_i386.deb
sudo dpkg -i cndrvcups-ufr2-uk_2.20-1_i386.deb

Connect the printer and setup Printing settings.