sudo setfacl -m u:user:rw /dev/snd/*
solved the problem as solution found on https://www.toolbox.com/tech/operating-systems/question/no-sound-at-all-in-lubuntu-1404-103114/ and somewhere on Ask ubuntu
sudo setfacl -m u:user:rw /dev/snd/*
solved the problem as solution found on https:/ /www.toolbox. com/tech/ operating- systems/ question/ no-sound- at-all- in-lubuntu- 1404-103114/ and somewhere on Ask ubuntu