[ubuntu] Minetest Help

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http://ubuntuforums.org – Hi I've got Minetest 0.4.3 installed and running through the Ubuntu Software Center a while back. This is now really old, and does not work with the servers running newer versions, and i want to upgrade to the current version, 0.4.7. I do not know how to download and install/run the program via terminal/other means. Would be very greatfull for some step by step instructions...... Thanks (Hardware)