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I'm not really computer literate. I use a navigation program called opencpn on my sailboat. First it stopped reading the GPS. Then the tool bar went blank. Now it won't quit - I have to restart the computer. I've damaged something else too because the Ubuntu Download centre will no longer download applications. Finally, Linux is getting more and more difficult to boot up. How I yearn for my old Apple!!! Can anyone help? I'm well out of my depth! Thanks

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