My Emacs lost the ability to highlight the syntaxes in 8.04

[yueyu lin]

When I finish the fresh new installing of Ubuntu 8.04, my emacs including
emacs 22 and emacs snapshot lost the highlighting syntaxes ability. While
the xemacs's highlighting still works well.
My home directory is reserved so all of my other emacs plugins are still
there.
I mainly use the XRef and have a lot of c projects. The XRef is still there
but I feel very uncomfortable without the syntax highlighting.
Does anyone meet the same problem and how to solve it? Thanks in advance.

-- 
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Yueyu Lin
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