Add Rose::URI prerequisite for Ubuntu systems

The Ubuntu parts of Makefile.install don't use the same list of CPAN
packages to install since for Ubuntu there are more distro packages
available than for Debian.

Spotted by Ben Shum.

Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>
Signed-off-by: Ben Shum <bshum@biblio.org>