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As for my printer:Canon MG5422
To remove the GPG public key error:Code: [Select]sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3BDAAC08614C4B38sudo apt-get updateANDIf you installed java using the aforementioned link http://forum.pcmech.com/threads/installing-java-in-linux-lite.231503/, you need to uninstall it using:Code: [Select]sudo apt-get purge oracle-java7-installersudo apt-get purge oracle-java7-set-defaultsudo apt-get updateThen try installing Java via Lite Software.
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3BDAAC08614C4B38sudo apt-get update
sudo apt-get purge oracle-java7-installersudo apt-get purge oracle-java7-set-defaultsudo apt-get update
After reboot, run Install Updates (Menu->Favorites->Install Updates), then try opening Lite Software.
Try this. Open up a terminal (Menu->Accessories->Terminal). Copy and paste in the following two lines, one at a time.Code: [Select]sudo rm /var/lib/apt/lists/* -vfsudo apt-get updateThen try opening Lite Software again.
sudo rm /var/lib/apt/lists/* -vfsudo apt-get update
Deselect the software source that refers to the launchpad ppa for java. Then try what was mentioned before with Lite Software.
Looks like your installs of java and Opera are causing this. You can go to Software & Updates (Menu->All->Software & Updates) . Choose the Other Software tab and uncheck the items referring to launchpad.net/java and the one referring to Opera.ORYou could uninstall them by trying:Code: [Select]sudo apt-get purge operasudo apt-get purge javaThen re-try what was mentioned before.
sudo apt-get purge operasudo apt-get purge java
To 5150Jim,You're off to a bumpy start. Let's try to smooth that out.1) You can install the Java web applet via Lite Software Menu->System->Lite Software.2) When in Lite Software, also consider installing Clementine (Music Player) and gtkpod (iDevices Manager) instead of iTunes.3) What is the make and model of your printer? Is your laptop the only computer that you cannot print with? How did you try to connect to the printer? Wirelessly, via a network connection, via a USB cable?