1) Download this – http://support-sg.canon-asia.com/contents/SG/EN/0100515301.html
2) Extract and copy directory to Desktop
3) Open Terminal and type “cd Desktop”
4) Type “cd cnijfilter-mx450series-3.90-1-deb”
5) Type “chmod +x install.sh”
6) To run install.sh script, type “./install.sh”
7) Plug in printer to USB and follow prompts.