You can uninstall or removes an installed ocaml-ulex package itself from Ubuntu 14.04 LTS (Trusty Tahr) through the terminal,
$ sudo apt-get remove ocaml-ulex
If you would like to remove ocaml-ulex and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove ocaml-ulex
If you use with purge options to ocaml-ulex package all the configuration and dependent packages will be removed.
$ sudo apt-get purge ocaml-ulex
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove ocaml-ulex