I've faced a similar issue. The problem with 'sudo cpan' as opposed to, say, 'su - -c cpan' (roughly) is that with sudo your user's environment is still active and CPAN.pm will, by default, use your home directory as its repository and pick up other config files from there.

In reply to Re^3: Can't use CPAN.pm once gpg installed by Errto
in thread Can't use CPAN.pm once gpg installed by jkeenan1

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