I can't install eclipse with
sudo apt-get install eclipse-platform
The response is:
Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package eclipse-platform
One way to install eclipse is through the software center.
Another way is to visit http://www.eclipse.org/downloads/compare.php?release=luna and compare the different packages,
download the package that meets your needs from http://www.eclipse.org/downloads/
and follow the installation instructions here