The internal speaker of my laptop never functionned under Ubuntu. I tried to follow indication on the web and now the jack audio does not work either.

The graphic interface for audio management now displays a 'dummy output' instead of the three possible outputs I used to have (one of them was working for the jack output).

In a terminal

alsamixer

raises an error:

cannot open mixer: No such file or directory

I did try to remove and reinstall alsa-utils but it did not change anything.

This happened after a failed atempt to install alsa-driver-linuxant_1.0.23.1_all.deb from here.

My sound card seems to be not recognised anymore. After reboot I have no more the sound icon in menu bar the upper right corner.

I think I have removed my sound card driver. Indeed, the command sudo lshw -class multimedia indicated audi device as unclaimed.

Any idea how I could revert to a better situation (that is jack support and alsa working)?

EDIT: The command lspci -nnk | grep -iEA3 audio gives

lspci -nnk | grep -iEA3 audio
00:1b.0 Audio device [0403]: Intel Corporation 82801I (ICH9 Family) HD Audio Controller [8086:293e] (rev 03)
    Subsystem: ASUSTeK Computer Inc. Device [1043:1893]
00:1c.0 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 [8086:2940] (rev 03)