Upgrading to a newer version of lilypond

[chip]

Ok, so after all is said and done in the other thread I started, here 
goes another one - is there a proper upgrade path or do I just download 
and extract the latest version over the top of the existing version? The 
Application Usage document only mentions 'upgrade' in relationship to 
convert-ly, not upgrading lilypond. Oh, I am using lilypond on a linux 
(ubuntu) box.
Thanks
--
Chip

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