The problem seems to happen only when installing EclipseIDE from Ubuntu "Software Center".
It somehow misses some packages needed to run plugin update properly.
Most notably "eclipse-pde".
Install it first by "apt-get install eclipse-pde" (It will install cvs plugin , jdt , default jdk etc also)
Then try running eclipse plugin install again.
The problem seems to happen only when installing EclipseIDE from Ubuntu "Software Center".
It somehow misses some packages needed to run plugin update properly.
Most notably "eclipse-pde".
Install it first by "apt-get install eclipse-pde"
(It will install cvs plugin , jdt , default jdk etc also)
Then try running eclipse plugin install again.