I was able to get my sound working by creating symbolic links in /lib/modules/2.6.24-15-generic/kernel/sound/ to /lib/modules/2.6.24-15-generic/ubuntu/sound/alsa-driver
(I wan't able to get 2.6.24-16 to boot - but i guess that's another bug)
I was able to get my sound working by creating symbolic links in /lib/modules/ 2.6.24- 15-generic/ kernel/ sound/ to /lib/modules/ 2.6.24- 15-generic/ ubuntu/ sound/alsa- driver
(I wan't able to get 2.6.24-16 to boot - but i guess that's another bug)