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