Procurando aqui nos repositórios do Ubuntu eu achei 2 pacotes instalados aqui com essa definição
converts between character sets in Perl
The iconv() family of functions from XPG4 define an API for converting
between character sets (e.g. UTF-8 to Latin1, EBCDIC to ASCII). They
are provided by libc6.
This package allows access to them from Perl via the Text::Iconv
e o libapache2-mod-php5
server-side, HTML-embedded scripting language (Apache 2 module)
This package provides the PHP5 module for the Apache 2 webserver (as
found in the apache2-mpm-prefork package). Please note that this package
ONLY works with Apache’s prefork MPM, as it is not compiled thread-safe.
The following extensions are built in: bcmath bz2 calendar ctype date dba
dom exif filter ftp gettext hash iconv json libxml mbstring mime_magic
openssl pcre posix Reflection session shmop SimpleXML soap sockets SPL
standard sysvmsg sysvsem sysvshm tokenizer wddx xml xmlreader xmlwriter zip
PHP5 is an HTML-embedded scripting language. Much of its syntax is borrowed
from C, Java and Perl with a couple of unique PHP-specific features thrown
in. The goal of the language is to allow web developers to write dynamically
generated pages quickly. This version of PHP5 was built with the Suhosin patch.
Você tem esses pacotes instalados ai?