I hope I've found the way to achieve this.
You can add new command into GDM menu. Just add this lines to /etc/gdm/gdm.conf 
:
CustomCommand0=/usr/bin/amixer -c 0 sset Master playback mute
CustomCommandText0=Mute
CustomCommandLabel0=Mute
CustomCommandLRLabel0=Mute
CustomCommandTooltip0=Mute
CustomCommandIsPersistent0=false
CustomCommandNoRestart0=true

If it works for everyone, we'd now add this into default Ubuntu
configuration and into various existing GDM/etc. configuration programs.
Please, report your success. :)

P.S. There's a blueprint on this issue:
https://blueprints.launchpad.net/ubuntu/+spec/mute-sound-on-login

-- 
Change audio startup order for laptop hardware controls
https://bugs.launchpad.net/bugs/49922
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