After receiving an update for Ubuntu Gustsy Gibbon v7.10, CD and DVD burning is now broken (other versions may also be affected). I remember seeing the original cdrtools files listed as being replaced or removed during the update, but didn't know the problems it was going to cause so I allowed the update to proceed. After the update, all I am able to burn are coasters. Initially I thought K3B was the cause, but Brasero and Nautilus also have the same problems and are unable to successfully burn CDs or DVDs properly (I am writing this from a different PC so I don't have the error messages at the moment). After doing some research on this problem, I found that the original cdrools utilities (which worked and were able to successfully burn both CDs and DVDs on the affected PC prior to the update) had been replaced with a broken fork (which explains the messages I saw regarding replacing/removing these files during an update). The presence of the broken version can be confirmed by checking the Programs being used for burning within K3B or from the command line. The link below to the cdrecord website has some information regarding this broken fork and how to confirm the version installed. Last time I checked, this problem has not been corrected through an update and fixing it manually is not something I know how to do yet. This needs to be fixed through an update. Hopefully this broken fork has not found it's way into the upcoming Hardy Heron release.
Thanks, and keep up the good work!