[xubuntu] 404 errors when using Synaptic script

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http://ubuntuforums.org – As I have an offline computer running Xubuntu 12.04.1 LTS and an online LiveCD of 10.04 I am using the excellent instructions I've found here to add software through Synaptic Package Manager taking the shell script and its results back and forth on a USB drive, and using Cortman's brilliant instructions on this site I've updated the repositories (if that's the right word) to keep Synaptic updated. Everything has worked wonderfully, though of course it's a cumbrous process; still, it works. Except for some reason when I use it to download VLC. The script gets many '404' errors, not, for some (Hardware)