In every major Linux GUI file manager, you can right-click on a file or directory to bring up a menu; the right-click menu will include an item for viewing and editing its properties. My preferred Linux GUI file manager is Konqueror. I think the default file manager in Ubuntu is
Nautilus.
In the command line, the command
ls -l will provide the same information, but you need to understand how
Linux file permissions are displayed in the output of
ls to interpret the output.