For some reason the sidebar and the top bar disappeared on my Ubuntu 14.04. Ctrl+Alt+t does not start a terminal. I tried to remove
.cache/compizconfig-1, I tried to restart and reinstall unity, but to no avail.
I have some files on my desktop. If I open them, the corresponding application starts but the menu at the top does not show.
I also tried to use ccsm as suggested here Unity doesn't load, no Launcher, no Dash appears but it did not work.