Toshiba and Linux does not play well...
You did not say anything about what sound hardware you have - it may vary
But if it is Intel HDA I have the probable solution for you
Edit the "/etc/modprobe.d/alsa-base" file adding at the end
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options snd-hda-intel index=0 model=toshiba
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gksudo gedit /etc/modprobe.d/alsa-base