Google Earth is proprietary, which means that it denies users the basic Four
Freedoms of free software, described in:
http://www.gnu.org/philosophy/free-sw.html
The Trisquel distribution and its community value these freedoms very
heavily, so it is highly unlikely you'll find help with Google Earth here.
For a free alternative to Google Earth, you can try out KDE's Marble project:
http://edu.kde.org/marble/ Marble is available through the GNOME Add/Remove
Programs feature, which can be found in the Trisquel main menu.
