How are you running cpan? perl -MCPAN? A script named cpan? In either case,
which perl is it actually using, and did that somehow change?
Does /usr/share/perl/5.8 actually exist (it's probably a symlink to /usr/share/perl/5.8.8), and if so, does it contain Exporter.pm?
What modules did you recently install? (You can check perldoc perllocal to see.)
Are you posting in the right place? Check out Where do I post X? to know for sure.
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Want more info? How to link or
or How to display code and escape characters
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