Hi happy ubuntu users

I have got ACER aspire 6920 with 82801H (ICH8 Family) HD Audio Controller and i don't hear any sound...

My device:

tomprider@tomprider-laptop:~$ sudo lshw -C multimedia
*-multimedia
description: Audio device
product: 82801H (ICH8 Family) HD Audio Controller
vendor: Intel Corporation
physical id: 1b
bus info: pci@0000:00:1b.0
version: 03
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=HDA Intel latency=0 module=snd_hda_intel

and

tomprider@tomprider-laptop:~$ sudo apt-get install linux-backports-modules
I'am reading lists of packages... Done
Vytvářím strom závislostí
Reading status actions... Done
E: I can't find package linux-backports-modules
tomprider@tomprider-laptop:~$

Can you help me please?????