I have removed flatpak with sudo apt-get purge flatpak; however, if I run locate flatpak I find several files and several directories. Can I remove them all with rm -r or there is a "better" way? If so, how do I have to do that?
Edit
Since my output is 21909 rows long and, as @mook765 noted, nobody will ever be so crazy to read them all I think I should reformulate the question as follows: if I had a normal installation of flatpak, what would be the best way to remove it and all its files and folders?