You can uninstall or removes an installed ant1.7 package itself from Ubuntu 12.04 LTS (Precise Pangolin) through the terminal,
$ sudo apt-get remove ant1.7
If you would like to remove ant1.7 and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove ant1.7
If you use with purge options to ant1.7 package all the configuration and dependent packages will be removed.
$ sudo apt-get purge ant1.7
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 ant1.7
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