I installed Eclipse via command apt-get install eclipse.

This command completed correctly.

After this, I run Eclipse and add some configurations: Added a new URL for "Available Software Sites".

On the next step, I try removed Eclipse via apt-get remove eclipse and install eclipse again.

And here I see a surprise: in the newly installed Eclipse, I see my old URL for "Available Software Sites".

So, I guess, that the configuration file(s) is not removed.

After this I tried different commands: something like this:

sudo dpkg -r eclipse

sudo apt-get --purge remove eclipse

sudo apt-get autoremove

But after I again install Eclipse I see my URL.

How I can fully remove Eclipse along with its configuration files?