[ubuntu] installing Canon ip2600 printer drivers on ubuntu 12.04

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http://ubuntuforums.org – I'm trying to setup a Canon ip2600 printer on Ubuntu 12.04.1 I've already got an HP Laserjet 2100M working using HPLIP Toolbox and configuration via http://localhost:631 But the Canon ip2600 printer driver is not listed in http://localhost:631/admin/ If I go into Ubuntu Software Center and try to install cnijfilter-ip2600series I get this popup "Requires installation of untrusted packages" and I can proceed no further.. even if I press on o.k. Are there any guidelines for installing Canon ip2600 drivers on Ubuntu 12.04? Info of driver is .. info: cnijfilter-ip2600series 3 (Hardware)