Q:

How to completely uninstall eclipse? 

I'm working on Eclipse Indigo on Ubuntu 12.04. 
I'm trying to completely uninstall Eclipse (with Synaptic Package Manager + Mark for complete removal), but when I reinstall it, I clearly see that it has kept all parameters, and history, which is what I'm trying to get rid of. 
I also tried the following. 
sudo apt-get purge eclipse
rm -r ~/.eclipse/

As suggested here, no luck either. 

A:

Run following commands:
sudo apt-get autoremove eclipse*
rm -r ~/.eclipse/

This will uninstall the dependencies and related packages that were installed along with eclipse.  This should do the trick. 

A:

You were almost done.  Add an asterisk (*) at the end of eclipse word. 
sudo apt-get autoremove eclipse*
rm -r ~/.eclipse/

Today I have encountered the same problem and searched for a solution.  I have seen this question.  I have tried the same steps but failed.  Then a friend of mine used those commands above.  
It removed all about eclipse.