Check user permissions before attempting to burn

Binary package hint: nautilus-cd-burner

To be able to burn cds in ubuntu you need to give the user the permission to do so.
There are several ways of doing this, the most user friendly way is to go to the User and Groups option in the Administration menu.

The CD burning functionality in Nautilus does not respect this option, it allows the user to burn a CD which will later fail because the user cannot write to the cdrom device.

Ideally nautilus-cd-burner should as well check if the user haven't logged out yet, because it will still fail if you find out that you lack permission to burn and later add it without logging out and in again.