Files and folders can sometimes get stuck in the trash can in Ubuntu. To easily fix this problem, you can open up nautilus with sudo permissions, move to the trash location and selecting the files and hitting shift+delete - Simply right-clicking and clicking move to trash will not work, and will just re-create the files in the trash can.
You can type the following to run nautilus with root permissions:
Now navigate to the following location from within nautilus.
Alternatively you can just type the whole thing in the terminal.
sodu nautilus /home/your_username/.local/share/Trash