Which Eclipse version are you using?
I suggest you to install this one:
Version Luna SR1 (4.4.1) from IoT Download - Linux* Development Kit
After you extract the files, you only needs to run: ./devkit-launcher
I saw in your log that the error is related to the location of the files, /home/lea/Downloads/iotdk-ide-linux//home/lea/Downloads/iotdk-ide-linux. Try to move the iotdk-ide-linux folder to /home/lea/ the launcher should look for in the location /home/lea/Downloads/iotdk-ide-linux but it is using the other location, that could be the root of the issue you are having. Try with this and let us know the outcome.
thanks. Up and running now