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Audio by default is muted in many cases. So you may just need to turn up the volume. Ubuntu tends to default to pulseaudio so try running pavucontrol, otherwise alsamxier -c 0 should work on the command line. Although these days your motherboard comes with an audio chipset and your video card might also come with an audio chipset, and the one you want to use is not 0 and therefor not the default. If you're not using pulseaudio or if pulseaudio fails to properly recognize your card (like my ice1712 / delta44) there are extra manual setting up steps you can do to make things work. In many cases the drivers are there and just fine, they just need configuration. And not always in a end user friendly way.
last thing is the Synaptics touchpad driver, what i did was search for "synaptics" in the package manager and i installed the xserver-xorg-input-synaptics which gave me vertical scrolling but the tap still didnt work. i dont know what should i do.
Back in the day there was tpconfig and various kernel parms you could pass to alter the touchpads behavior. mousedev.tap_time=0 or whatever it was to disable tapping (hated tapping). With tpconfig to disable the other behaviors, as I like my scratchpad to point only and my buttons to click only. But things are noticeably different these days.
$ lsmod | grep -i "mouse"
# modinfo psmouse
Most things under parm: are things you can add to a modprobe statement after the module to override defaults. Or change some stuff in /etc/modprobe.d/, or explicitely pass to the kernel at boot via the bootloader (psmouse.smartscroll=0). And probably some other tricks I have yet to learn.
If you can't find a program to alter the behavior of the touchpad you can do it directly with the X server configuration.
I have a file /etc/X11/xorg.conf.d/50-synaptics.conf with this content:
# # Copy this file to /etc/X11/xorg.conf.d/ and edit the copy
# # Use "synclient -l" to see all available options
# # Use "man synaptics" for details about what the options do
Option "TapButton1" "1"
Option "TapButton2" "0"
Option "TapButton3" "0"
Option "VertEdgeScroll" "1"
Option "HorizEdgeScroll" "1"
Option "MinSpeed" "1.1"
Option "MaxSpeed" "1.9"