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Thanks again. I followed your instructions and failed again (I fear I'm not up to the editing task. I just made things worse, I suspect.)
Update manager is now telling me:

An unresolvable...

Thanks for your reply. By "when I try to install", after download, it tells me how many updates have been downloaded and the size. There is also a button which says "Install" which I then click.
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I've been using the current version of Ubuntu (with great pleasure)for a while now, but this is my first problem (and hence my first post).

My problem is that Update Manager downloads 84 updates...