Unless you've done so I'd start with trivial checks:

Verify CPAN::Debug is accessible when you do 
/path/to/perl -e 'use CPAN::Debug'

[download]
If more than one version of Perl is installed, use full path for perl command to make sure you're installing the module for the correct version.

In reply to Re: Problem installing missing modules with CPAN::Shell by hotpelmen
in thread Problem installing missing modules with CPAN::Shell by sotona

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