On perlbrew.pl, you can find instructions for how to install perlbrew directly, without having to go through cpan, for example:

\wget -O - https://install.perlbrew.pl | bash

[download]

As for cleaning up, you might want to check your environment variables in e.g. ~/.profile and ~/.bashrc whether there's anything Perl-related being set there, and also the AM's suggestion of deleting ~/.cpan should reset its configuration and build cache (the same goes for ~/.cpanm).

In reply to Re: Fixing my CPAN installation by haukex
in thread Fixing my CPAN installation by IoIxD

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