I get
sudo apt install cups
Reading package lists… Done
Building dependency tree
Reading state information… Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
cups : Depends: libcups2 (= 2.2.1-8+deb9u2) but 2.2.8-5 is to be installed
Depends: libcupscgi1 (>= 1.4.2) but it is not going to be installed
Depends: libcupsimage2 (>= 1.4.0) but it is not going to be installed
Depends: libcupsmime1 (>= 1.4.0) but it is not going to be installed
Depends: libcupsppdc1 (>= 1.4.0) but it is not going to be installed
Depends: cups-core-drivers (>= 2.2.1-8+deb9u2) but it is not going to be installed
Depends: cups-daemon (>= 2.2.1-8+deb9u2) but it is not going to be installed
Depends: ghostscript (>= 9.02~) but it is not going to be installed
Depends: cups-client (>= 2.2.1-8+deb9u2) but it is not going to be installed
Depends: cups-ppdc but it is not going to be installed
Depends: cups-filters (>= 1.0.24-3~) but it is not going to be installed
Recommends: colord but it is not going to be installed
Recommends: cups-filters (>= 1.0.42) but it is not going to be installed or
foomatic-filters (>= 4.0)
Recommends: printer-driver-gutenprint but it is not going to be installed
Recommends: cups-filters (>= 1.0.36) but it is not going to be installed or
ghostscript-cups (>= 9.02~)
E: Unable to correct problems, you have held broken packages.