I could write to a DVD+RW using K3b 0.12.14 on a default Kubuntu 6.06 LTS release with KDE 3.5.3 packages downloaded from kubuntu.org.
Kernel is 2.6.15-26-386 -- Problems accessing Sony DRU-810A DVD drive https://launchpad.net/bugs/38851 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs