Según he visto, la forma de instalar cosas o lo que yo sé es con el siguiente comando:
mrco1965@Local54:~$ cpan install WWW::Mechanize
CPAN: Storable loaded ok (v2.20)
Going to read '/home/mrco1965/.cpan/Metadata'
Database was generated on Sun, 07 Aug 2011 00:28:23 GMT
CPAN: LWP::UserAgent loaded ok (v5.834)
CPAN: Time::HiRes loaded ok (v1.9719)
Fetching with LWP:
http://www.perl.org/CPAN/authors/01mailrc.txt.gz
Going to read '/home/mrco1965/.cpan/sources/authors/01mailrc.txt.gz'
CPAN: Compress::Zlib loaded ok (v2.02)
............................................................................DONE
Fetching with LWP:
http://www.perl.org/CPAN/modules/02packages.details.txt.gz
Going to read '/home/mrco1965/.cpan/sources/modules/02packages.details.txt.gz'
Database was ...