Pretty sure this is not the perfect place to post this, but I'm sure that all developers working on Ubuntu get this error, while users just use the standard drivers.
With the more recent Catalyst downloaded from the AMD-website, starting the Catalyst Control Center pops up a small black screen with title "amdxdg-su: amdcccle" asking for the root-password. After entering the password nothing happens. Running "sudo amdcccle" works without problems.
The problem also rises when installing the drivers without sudo, which always returns an error that root-access is needed.