@1: After you've set the volume how you like it.... hit alt+f2 and type orca and hit enter
Or grab Ubuntu Mate, that comes with Orca preinstalled and works. Alt+Super+S doesn't, AFAIK anyhow work in Debian, try in Ubuntu Mate.
@Maggerp: Vinux is no longer maintained and it is going EOL next year. I'd suggest something else, Accessible Coconut at cocofrix.com is a way more (as in based on Ubuntu 18.04.1) version of Ubuntu with Mate that's got a ton of acessibility stuff built in and is actually maintained. That list is way, way out of date. There's another list floating around that's even more out of date mind, but Vinux is long, long dead and not maintained, the only people maintaining it are Ubuntu via their updates for 14.04 any more and once those end you're SOL
@1: It's apt-get with apt dash get, all one word.
So f.ex ry this:
sudo apt-get orca
That should install everything.
Warning: Grumpy post above
Also on Linux natively
Jace's EA PGA Tour guide for blind golfers