There is an ongoing outage on the primary CPAN mirror. It is possible to work around the issue by using MetaCPAN as a mirror.
See Array::Unique for documentation
Module Install Instructions
To install Array::Unique, copy and paste the appropriate command in to your terminal.
cpanm Array::Unique
perl -MCPAN -e shell
install Array::Unique
For more information on module installation, please visit the detailed CPAN module installation guide.