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Have you ran a sudo apt update?

Package indices change as new packages are released.

You need to tell apt to update its internal copy of those indices, as otherwise it will try to fetch packages (ie: URLs) which don't exist any more.

You do that with a sudo apt update.

I had previously installed foxy desktop through the installation instructions, over two weeks ago.

Please always include a link to any tutorials or instructions you refer to in your question text, as otherwise we cannot know which instructions you've followed.

As there are quite a few different ones, this is important information.

Is the package broken, or is it me? Can I do something about it? Should I simply wait for the packages and/or version information to be updated?

Have you ran a sudo apt update?

Package indices change as new packages are released.

You need to tell apt to update its internal copy of those indices, as otherwise it will try to fetch packages (ie: URLs) which don't exist any more.

You do that with a sudo apt update.

. Then try running your apt install command again.

Alternatively, the Ubuntu Software (or whatever it is called on Focal) and/or the Ubuntu software updates tool should alert you about the availability of updates.