apt-get update / install

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http://www.linuxquestions.org – Hi all, Quote: Your computer has a list (such as a catalog) that contains all the available software that the ubuntu servers have available... This (quoted from here) seems to say that there is a file on my Ubuntu server which lists all available packages (with their version numbers). If so can anyone please tell me where I can find / view this file? And anyway after running $ apt-get update can I check what version of a particular package would be installed by $ apt-get install ? Thanks... (HowTos)