alsamixer F5 shows All channels, both Playback and Capture. So don't worry about that.
What does F6 show for soundcard/s?
We are seeing a lot of sound issues with Intel Sound Cards, so determining exactly what soundcard you have and investigating from that may help.
I assume all the basic pre-installation checks (e.g. BIOS Secure Boot, Fast Boot disabled etc) have been carried out as described here: Before you install