I have a standard user and administrative user on a computer that runs Ubuntu. When I'm logged in as standard user, I can read most of the folders in the file system, many of which appear to be owned by root and which I don't think should be readable by the standard user. For example, as standard user, I can read the admin's home folder, which is owned by the admin user and not shared. Another example: standard user can access /bin. /bin is owned by root and most of the the files in it are owned by root. Yet standard user can at least access the folder, and maybe read the files. Does anyone know why this is happening and how I can change it?