Comment 19 for bug 67443

Thank you Thom Pischke!

1 - I edited /etc/X11/xorg.conf, changed DefaultDepth from 24 to 16.
2 - Logged out.
3 - ctrl-alt-backspace to restart X.

Now the progress bar is visible!

(My graphics is i810)

I don't know in which circumstances I would need a 24 depth color ...

So I consider solved for me as well.