There may well be a very simple answer to this but having googled for an hour, I am resorting to asking here.
I am simply trying to install eclipse Indigo(3.7.2) on Ubun
I had the same problem and found out it was because I had installed another version of eclipse which I had downloaded manually. I simply removed the package again ("sudo apt-get remove eclipse") and deleted everything concerning eclipse:
and then reinstalled it using "sudo apt-get install eclipse". Worked fine for me.