No, using gksu is a deprecated method for a long time, instead programs are now run as a normal user, and get admin rights using PolicyKit. In Maverick, this is for example how updates-manager works.
You're not supposed to run 'gksu users-admin', and I really don't see how you'd think of doing so. Just use System->Administration->Users and Groups, or type 'users-admin'.
No, using gksu is a deprecated method for a long time, instead programs are now run as a normal user, and get admin rights using PolicyKit. In Maverick, this is for example how updates-manager works.
You're not supposed to run 'gksu users-admin', and I really don't see how you'd think of doing so. Just use System- >Administration ->Users and Groups, or type 'users-admin'.