I am running Jaunty Jackalope and after the last update the OS can't see the optical drive. I checked to see if the sg module was running and I got this message; modprobe sg FATAL:module sg not found.
find /lib -iname "*sd_mod*" gets this;
/lib/brltty/libbrlttysgs.so
/lib/modules/2.6.28-15-generic/kernel/sound/isa/snd-sgalaxy.ko
/lib/modules/2.6.28-15-generic/kernel/net/decnet/netfilter/dn_rtmsg.ko
/lib/modules/2.6.28-15-generic/kernel/drivers/media/video/videobuf-dma-sg.ko
/lib/modules/2.6.28-15-generic/kernel/drivers/char/ipmi/ipmi_msghandler.ko
/lib/modules/2.6.28-11-generic/kernel/sound/isa/snd-sgalaxy.ko
/lib/modules/2.6.28-11-generic/kernel/net/decnet/netfilter/dn_rtmsg.ko
/lib/modules/2.6.28-11-generic/kernel/drivers/media/video/videobuf-dma-sg.ko
/lib/modules/2.6.28-11-generic/kernel/drivers/char/ipmi/ipmi_msghandler.ko
/lib/modules/2.6.28-14-generic/kernel/sound/isa/snd-sgalaxy.ko
/lib/modules/2.6.28-14-generic/kernel/net/decnet/netfilter/dn_rtmsg.ko
/lib/modules/2.6.28-14-generic/kernel/drivers/media/video/videobuf-dma-sg.ko
/lib/modules/2.6.28-14-generic/kernel/drivers/char/ipmi/ipmi_msghandler.ko
/lib/modules/2.6.28-13-generic/kernel/sound/isa/snd-sgalaxy.ko
/lib/modules/2.6.28-13-generic/kernel/net/decnet/netfilter/dn_rtmsg.ko
/lib/modules/2.6.28-13-generic/kernel/drivers/media/video/videobuf-dma-sg.ko
/lib/modules/2.6.28-13-generic/kernel/drivers/char/ipmi/ipmi_msghandler.ko

I checked to make sure that the motherboard could see the optical drive by booting to a live cd and it worked just fine, so the motherboard sees it.

I would appreciate any suggestions.

Thanks, zoey

hi Zoey

try this

reboot your machine. while grub is loading, press the escape key.
when the grub menu comes up. select the previous kernel to boot.
after linux boots, check to see if you can use your drive.
if it works good.

ONLY DO THE NEXT PART IF YOU ARE SURE IT WORKS

while under the older kernel, open terminal
type
sudo gedit /boot/grub/menu.lst

after gedit opens the file.
scroll down and find the newer kernel and delete the listings for that kernel

below is what mine looks like.
if the newer kernel is 2.6.24-34 that is causing the problem delete the entries
for both generic and recovery mode.
in my file it would be the first 8 lines.
save the menu.lst and reboot.

if this works. do anther update and see if it installs correctly this time.

ONLY DO THIS IF YOU ARE SURE IT WORKS AFTER BOOTING THE OLDER KERNEL

good luck

Vanessa

title Ubuntu 8.04.2, kernel 2.6.24-24-generic
root (hd0,0)
kernel /boot/vmlinuz-2.6.24-24-generic root=UUID=e3e55ff5-ea86-401e-8972-87f570eddae9 ro quiet splash
initrd /boot/initrd.img-2.6.24-24-generic
quiet

title Ubuntu 8.04.2, kernel 2.6.24-24-generic (recovery mode)
root (hd0,0)
kernel /boot/vmlinuz-2.6.24-24-generic root=UUID=e3e55ff5-ea86-401e-8972-87f570eddae9 ro single
initrd /boot/initrd.img-2.6.24-24-generic

title Ubuntu 8.04.2, kernel 2.6.24-23-generic
root (hd0,0)
kernel /boot/vmlinuz-2.6.24-23-generic root=UUID=e3e55ff5-ea86-401e-8972-87f570eddae9 ro quiet splash
initrd /boot/initrd.img-2.6.24-23-generic
quiet

title Ubuntu 8.04.2, kernel 2.6.24-23-generic (recovery mode)
root (hd0,0)
kernel /boot/vmlinuz-2.6.24-23-generic root=UUID=e3e55ff5-ea86-401e-8972-87f570eddae9 ro single
initrd /boot/initrd.img-2.6.24-23-generic

Thank You Vanessa,

I tried booting into the old kernel with high hopes, but it didn't work.

Thanks again, zoey