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		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.
OR
You could uninstall them by trying:
Code:
sudo apt-get purge opera
sudo apt-get purge java
Then re-try what was mentioned before.
	
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		And this looks like a good resource on your printer.  When they mention Synaptic Package Manager, you get to that in Linux Lite by going to 
Menu->System->Install/Remove Software.
http://ubuntuhandbook.org/index.php/2014...ntu-14-04/
	
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		Deselect the software source that refers to the launchpad ppa for java.  Then try what was mentioned before with Lite Software.
	
	
	
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		After reboot, run Install Updates (Menu->Favorites->Install Updates), then try opening Lite Software. 
	
	
	
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		To remove the GPG public key error:
Code:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3BDAAC08614C4B38
sudo apt-get update
AND
If you installed java using the aforementioned link 
http://forum.pcmech.com/threads/installi...te.231503/, you need to uninstall it using:
Code:
sudo apt-get purge oracle-java7-installer
sudo apt-get purge oracle-java7-set-default
sudo apt-get update
Then try installing Java via Lite Software.
	
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