Comment 8 for bug 1749831

I ran into the same problem this morning.

So far as I can tell, ubuntu-desktop depends on unity. unity depends on
compiz-core-abiversion20151010. compiz-core-abiversion20161010 is a virtual
package which is made available from compiz-core.
Two versions of compiz-core are available, one of them provides
compiz-core-abiversion20151010. So far, so good. Unfortunately, the
compiz-core package is intertwined with a bunch of other packages in the
compiz metapackage. There are two versions of the compiz metapackage available, but both
reference newer versions of compiz-core than the one that provides
compiz-core-abiversion20151010.