I recently upgraded my Linux Ubuntu from 10.04 to 11.04, but after the upgrade my Eclipse lost it's plugins.
So I re-installed subclipse (using http://subclipse.tigris.org/update_1.4.x), but it does not work;
There is a "<SVN Repository Exploring>-perspective>" but it does not contain the right Views, and I can't add them manually, beacause there is no 'SVN'-category.

I tried to reinstall Eclipse, but when I remove and re-add it using Ubuntu Software Center all features and plug-ins are exactly the way they were... So I still can't use SVN.

Can anyone help me fix my problem, or tell me how I can really delete Eclipse and reinstall it from scratch?

Try eclipse with a new and clean workspace, also try remove all the old plugins. The reinstall subclipse. The plugins don't show up does not mean they were lost, they may be still there and corrupted.

Still no luck...
I removed all SVN-related plugins, re-installed Eclipse and re-installed the plugins.

It just lools like it's not installed (there is no perspective, no views, no preferences, nothing), but I'm not able to install subclipse or svnkit because it's already installed...

Edit;
I installed Eclipse 3.6 from the Eclipse update site and now everything works without problems...