linux and ifl90 sound problem

hello, I have had my ifl90 for some time now but just go around to installing ubuntu. Right now I have it set up as a dual boot with vista and everything is working except for the sound. I am fairly new to linux in general so I tried using some of the guides found on the web as well as some on the ubuntu forums, but I just cant seem to get it right. My last attempt was using the guide off of this website: "http://lddubeau.com/avaktavyam/linux-on-a-compal-ifl90/" and after I type "sudo apt-get update" it gives me this warning: "W: GPG error: http://download.tuxfamily.org gutsy Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3E231AC7F4ECF181" If anyone knows what is going on or know how to fix this problem it would be greatly appreciated. Thanks

 

Try this

sudo rm /lib/modules/`uname -r`/ubuntu/media/snd-hda-intel/snd-hda-intel.ko
sudo aptitude install build-essential linux-headers-$(uname -r) libncurses5-dev libncursesw5-dev
cd /usr/src
mkdir alsa
cd alsa
wget ftp://ftp.alsa-project.org/pub/driver/alsa-driver-1.0.15.tar.bz2
tar -xf alsa-driver-1.0.15.tar.bz2
cd alsa-driver-1.0.15.tar.bz2
./configure --with-cards=hda-intel
make
sudo make install