ruby@ruby-Z87X-HD3:~$ sudo apt-get install libpdf-api2-perl
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libpdf-api2-perl is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
ruby@ruby-Z87X-HD3:~$ PDF::API
PDF::API: command not found
ruby@ruby-Z87X-HD3:~$ PDF::API2
PDF::API2: command not found
ruby@ruby-Z87X-HD3:~$ perl perl.pl 
Can't locate object method "new" via package "PDF::API2" (perhaps you forgot to load "PDF::API2"?) at perl.pl line 1.