I messed up my phpmyadmin, I haven't logged in phpmyadmin for a while and as a result I forgot my password.

I decided to purge PHPMyAdmin:

sudo apt-get purge phpmyadmin

I did get some error messages asking for my password, but I forgot that, so I just pressed ignore, after that, I installed phpmyadmin again:

sudo apt-get install phpmyadmin

But now, when I logging to my phpmyadmin, I get a 404 not found error page!?

How do i completely remove phpmyadmin?