You can uninstall or removes an installed libosgearthutil2 package itself from Ubuntu 14.04 LTS (Trusty Tahr) through the terminal,
$ sudo apt-get remove libosgearthutil2
If you would like to remove libosgearthutil2 and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove libosgearthutil2
If you use with purge options to libosgearthutil2 package all the configuration and dependent packages will be removed.
$ sudo apt-get purge libosgearthutil2
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 libosgearthutil2