Can you read this page https://wiki.ubuntu.com/DebuggingSoundProblems in order to see what may be your problem.
If this page can not solve your problem, please post a comment and set the status of this bug report to new.
Can you give the result of cat /proc/asound/cards
Can you read this page https:/ /wiki.ubuntu. com/DebuggingSo undProblems in order to see what may be your problem.
If this page can not solve your problem, please post a comment and set the status of this bug report to new.
Can you give the result of cat /proc/asound/cards