Can't start Eclipse Juno (Ubuntu 12.10)

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http://askubuntu.com – I installed eclipse though the unbuntu software center but I experienced some issues and I wanted to install the official eclipse version. I downloaded eclipse classic 4.2.1 http://www.eclipse.org/downloads/download.php?file=/eclipse/downloads/dr... Extracted it, but if I double click "eclipse" it doesn't do anything. Any ideas how I can fix this? (HowTos)