Comment 5 for bug 1292396

"I would recommend trying to fix your packages by explicitly installing the unity-desktop package and see if it fixes your current problems."
You mean - ubuntu-desktop, right?
For me, this is (or, to be precise - was) not the best solution :), because installing ubuntu-desktop also causes installation of lots of packages, which I find pretty useless and unnecessary.
Like I wrote, I just installed unity package, and after resetig Unity (dconf reset -f /org/compiz/) everything was back to normal.

"[...] a whole slew of packages, including the all-important ubuntu-desktop metapackage, were removed on 2014-03-13 around 23h00."
Yes, it's true. But this wasn't effect of my action - it happened as a result of this particular upgrade.