Você precisa instalar o libwww-perl
.
sudo aptitude install libwww-perl
OR
sudo perl -MCPAN -e 'install Bundle::LWP'
OR
wget http://search.cpan.org/CPAN/authors/id/G/GA/GAAS/libwww-perl-6.04.tar.gz
tar xzf libwww-perl-6.04.tar.gz
cd libwww-perl-6.04
perl Makefile.PL
make
sudo make install