To give you a word of advice by somebody who severely damaged his Debian distribution by installing a different perl executable - don't. The system Perl executable should never be changed other than through the vendor's own upgrade mechanism. Yes, this means you should install your own Perl separately if the system Perl is not enough for you.

For example, Debians (and by inheritance, Ubuntus) apt-get was at some time (and I presume it still is) written in Perl - if you install another Perl, all the modules needed by apt-get will become unavailable to your new Perl unless you manually hunt them down and copy them over. The Debian folks didn't put these modules onto CPAN so you can't conveniently install them into other Perls, either.

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