[ubuntu] update manager quits half way

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http://ubuntuforums.org – My update manager will not complete an update. Even just one or two items. It stops 1/2 way and locks up the computer. If I go to terminal before I use update manager and launch: [sudo apt-get update && sudo apt-get dist-upgrade] Then launch update manager, it works fine and completes the update. What do I need to do to clean this up so it will work without the terminal upgrade??? Thanks! Donaldt (Hardware)