[ubuntu] updating and apps without internet connection

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http://ubuntuforums.org – I came upon an old Dell tower with no wifi and I do not want to hook it up to the internet anyway. But what I do want to do is install the 12.04 updates and some applications from synaptic, or however. I have a netbook with wifi and synaptic, and I downloaded the update packages only, but now I am stuck - I do not know where the packages are so I can save them to a USB and install them on the Dell tower. i thought when I selected the "download only" dialog it would allow me to choose where I wanted to put the packages, but it did not allow me to. (Hardware)