Can't use gnome-disk-utility and users-admin
 

Hi,

In my custom Ubuntu, I can't use gnome-disk-utility application to format USB drive ("Permission denied" error). I have to run gnome-disk-utility with "sudo" to do that.

I guess that I am not in a group which has permission to working with devices, but I can't find out what group is.

Another problem is I can't use "Users and groups" application (users-admin) to manage users and groups, I click buttons but nothing happens I guess that I don't have some kind of permissions too.

How could I fix these 2 problems? Thank you!

You need to be in the adm group.