Thanks! I make progress!
Driver is Gallium 0.4 on NVE7. I don't know what that means though, or which
of the to graphics cards that it drives.
And now I was able to find and start the GNOME shell! (Text on my login
screen is extremely tiny, would never have found it without help).
My GNOME Shell shows a panel on the top, but nothing at the bottom. Is that
correct?
Top left has a button for Activities, which has the same function as alt+F1
now. With mouse to the bottom, a bar for notifications emerges.
I miss the Start-button like menu in standard Trisquel. Perhaps I need to
install the gnome package also? (Full GNOME desktop that description said.)