I just ran
sudo apt-get update && sudo apt-get upgrade and suddenly there was no sound.
I rebooted and I heard the bios boot sound but when Ubuntu boots there is no sound. I followed instructions on this post but when I uninstall
alsa-base I couldn't install it back and
apt says there is no install candidate :
Package alsa-base is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'alsa-base' has no installation candidate
I tried to do this but it doesn't work,
apt just gets 404 on that repo.
Now I can't even get to the System settings page since
alsa-base was uninstalled.