I filed a bug in Launchpad describing problems with my HP optical drive that stopped being recognized upon upgrading to Karmic.* I am hoping this way to encourage that this very basic functionality be returned in Lucid.* If you can contribute to a solution, please do so in Launchpad.
I am not much of a techie, so my description of the problem is probably lacking needed information.* Here is the text:
I have an HP dvd840 CD/DVD burner which worked in previous versions.
This drive will work to boot a live CD; if I boot generic Ubuntu Karmic
from a USB key I can use the drive normally for playback. I did not
test it for burning.
From the menu, Places->cdrom0 produces a window with the error:
"Unable to mount cdrom0 Special device /dev/scd0 does not exist" I have
perused similar problems on the forums, asked on the Ubuntu Studio
list, and looked in Launchpad, so far nothing suggested has worked. I
have added modules to /etc/modules--I can't remember what else I tried.