With great pleasure and gratitude, I would like to inform Ubuntu-au-request that the temporary disappointments and frustrations caused with the new upgrade of Ubuntu 8.04 in regards of the Virtualbox and Sound are over. I specially would like to express my sincere thanks to Andre Mangan for his help and support in his continuous care and communications skills in solving the Virtual box proper setup and successful outcome. I diligently searched the Ubuntu Forums, which I might say have a colossal information and solution bases, to resolve the Sound in Ubuntu 8.04, and with great delight I came across the following Forum entry; <a href="https://help.ubuntu.com/community/SoundTroubleshooting">https://help.ubuntu.com/community/SoundTroubleshooting</a> where the first entry was my salvation; "Upgrading from an earlier release of Ubuntu to Hardy you may end up missing kernel sound modules if "find /lib/modules/`uname -r` | grep snd" returns no results, then your upgrade/dist-upgrade missed the linux-ubuntu-modules package, you need to install it and reboot: sudo aptitude install linux-ubuntu-modules-`uname -r` linux-generic " As instructed, I rebooted and voila! At the present Ubuntu 8.04 is magical with Firefox3 and with all its formidable Applications. Thank you for all the support I received.