Why should "/boot" be on a separate partition?

[Masatran (Deepak), R.]

Why should "/boot" be on a separate partition (rather than on the "/"
partition)?

I have installed Debian 3.1 with a separate "/boot" partition. I intend
installing Ubuntu 5.10 . Should I share the "/boot" partition between Debian
and Ubuntu?
-- 
http://research.iiit.ac.in/~masatran/

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