Trash in Ubuntu

My father had a strange problem. He couldn't delete few files from his Trash. First we figured out that he didn't have 'write' rights to them, even if he saved them from a mail. My first suggestion was to change permissions, but he couldn't (using Nautilus). Today I had a chance to sit in front of dad's computer, but I couldn't find where is the Trash. I decided to check if there were any similar bug report in the launchpad. I found this suggestion, which work for me (of course I need to make chmod -R +w ~/.local/share/Trash/files/*). And the point I would like to save here is that the trash in Ubuntu is in:

~/.local/share/Trash/files/