Q:

how do I remove / delete " all video downloader "?

It's not working for me and I didn't bother understanding why, simply removed it from Ubuntu Software Centre where I previously got it from. 
Now it's still on the left-side bar with all the other icons. also, I've gave a search in computer files (/usr/share/applications/) it's there but can't do anything 
Please tell me if there's a way to delete/erase apps on Ubuntu without spending time on forums and googleing, must be a way ..
Many Tahnks.    

A:

Some applications create .desktop files in ~/.local/share/applications. Have you checked there?
Also, using the Software Center to delete applications leaves system-wide config files behind. If you want to get rid of those as well, you may want to use:
sudo apt-get purge package_name

In any case, you'll need to get rid of config file in your home folder yourself. These are mostly in ~ or in ~/.config or in ~/.local.

