Android plugin install problems in eclipse
I did not found any solution for this. But instead of using eclipse installed with
sudo apt-get install eclipse
I downloaded it from a web page and I start that (the downloaded) eclipse, and with that version it works just fine
You need to install GEF and WST first.
GEF Update Site : http://download.eclipse.org/tools/gef/updates/releases/ (dead)
WST Update Site : http://download.eclipse.org/releases/galileo
I had the same problem, run eclipse as administrator and try to instal ADT plugin again, it works.