You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 cups : Depends: cups-daemon (>= 2.1.3-4ubuntu0.2)
 cups-core-drivers : Depends: cups-daemon (>= 2.1.3-4ubuntu0.2)
 cups-daemon : Depends: libcups2 (= 2.1.3-4) but 2.1.3-4ubuntu0.2 is to
be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

apt-get

sudo apt update

cpus

sudo apt-get -f install

/var/log/apt/history.log

cups

preleased updates(xenial-proposed)

preleased updates(xenial-proposed)

preleased updates(xenial-proposed)