you can install skype from the medibuntu repository.
follow the instructions on adding the repository here: https://help.ubuntu.com/community/Medibuntu (not sure which Ubuntu version you have installed - probably 8.10 though), run the command at the end
sudo apt-get update && sudo apt-get install medibuntu-keyring && sudo apt-get update
and install skype with
Code:
sudo apt-get install skype
it should be a lot easier for you. It'll also update skype automatically then.
However, I don't know if it offers the 64 bit package (seems like it does).
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