Hello Gulu Sorry for delay and sorry for the bad reply software sources is no loger under System - Admin.(how many things changes every six month! and the next will be a partial revolution) Click on Applications - Ubuntu software center - Modify (or edit, i'm translating), - Software sources Click on Updates tab, check that Proposed and backports are not enabled, then below verify that in the button appear ' Normal releases', elsewhere click the button and select it. Close open a Terminal and type: sudo apt-get clean then run again Update Manager. If don't work, please click on Places - Computer - File System - etc - apt - right click on sources.list file and select open with 'text editor', copy and paste here. Or more simply in a terminal cat /etc/apt/sources.list copy all the output and paste Regards Fabio
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