As I mentioned in 1st post, I'm running Education Lite 64-bit. Yes, I saw some of those threads, but don't know what I should try. A bit afraid of breaking things, make it worse etc... The strange thing is some guides mention about accessing Settings> Sound, but that's not available on my system.
Also tried alsamixer, it said no device available.
Sorry I saw "Education" and for some reason overlooked "Lite".
I am on Core, so cannot vouch that Settings>Sound should be same in Lite, though I though they were at least similar. Maybe @Aravisian or others on Lite can chip in.
Have you set your Software Updates to point to "Main Server" in prefrernce to a country server?
Then have you visited Software and checked for any additional drivers?
I have no idea what sound card is in your machine and their website does not seem willing to reveaal that information, even if we were to know which version of T100 you have.
Can you provide us with listing from this command: