I got hit by this after running "apt update" this morning - I noticed
Unity was one of the packages updated.
I discovered a workaround on Ask Ubuntu:
working-in-ubuntu-16-04 which led me to this bug. The work-around works
I also found that the "grid" features of unity no longer worked after
this morning's update: dragging a window to the left or right edge of
the screen no longer resized it to the "left-half" or "right-half" size
(i.e. the full height of the screen, and half the width, snapped to the
left or right edge). I enabled the "grid" setting in the "CompizConfig
settings manager", which restored the feature, however I was prompted to
decide about a number of keyboard shortcut conflicts. I mention this
here because the symptoms occurred at the same time as this bug, and in
the same area, therefore they might have the same root cause.
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keybard shortcuts stopped working for switching workspaces
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