/usr/share/myspell/dicts/hyph_it_IT.dic is in hyphen-it 1:3.3.0-2ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/myspell/dicts/../../hyphen/hyph_it_IT.dic
/usr/share/myspell/dicts/../../hyphen/hyph_it_IT.dic