I'm currently having an issue trying to give a user the permissions that the 'root' user has, which is to modify anything in the / directory. I've changed the /etc/passwd file but still no luck. I've also went into visudo and did the pi ALL=(ALL:ALL) ALL, and that still didn't solve my issue. 
Giving a user permission to modify/edit/delete files in / directory (Not using Terminal, but with File Explorer)
permissions;terminal;raspbian