Volume low even at maximum

Try the PCM settings in alsamixer - Open terminal (Ctrl+Alt+T) and type alsamixer: enter image description here

You may need to select the sound card with F6 first.

Turning up all the other controls may also help smiley

1. Open terminal Ctrl + Alt + T

2. Install PavuControl sudo apt install pavucontrol

3. Open PulseAudio Volume Control pavucontrol

4. Output devices Set to 100% (0dB) the port are you using (Speakers / Headphones etc)

enter image description here

You should enable "Louder than 100%" in sound settings.
This works at least in Ubuntu 17.10 Screenshot

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