Install Official Eclipse on Ubuntu

If you've downloaded Eclipse from their official website, follow these steps for the installation. (Ubuntu 12.04 LTS)

1. Extract the eclipse.XX.YY.tar.gz using

   tar -zxvf eclipse.XX.YY.tar.gz
   

2. Copy the extracted folder to /opt

   sudo cp -r eclipse.XX.YY /opt
   

3. Create a desktop file and install it:

   gedit eclipse.desktop
   

   and copy the following to the eclipse.desktop file.

   [Desktop Entry]
   Name=Eclipse 
   Type=Application
   Exec=eclipse
   Terminal=false
   Icon=eclipse
   Comment=Integrated Development Environment
   NoDisplay=false
   Categories=Development;IDE;
   Name[en]=Eclipse
   

   then execute the following command to automatically install it in the unity:

   sudo desktop-file-install eclipse.desktop
   

4. Create a symlink in /usr/local/bin using

   cd /usr/local/bin
   sudo ln -s /opt/eclipse/eclipse
   

5. For eclipse icon to be displayed in dash, eclipse icon can be added as

   sudo cp /opt/eclipse/icon.xpm /usr/share/pixmaps/eclipse.xpm
   

　　That's it.