Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
 openjdk-8-jdk-headless : Depends: openjdk-8-jre-headless (= 8u91-b14-0ubuntu4~16.04.1) but it is not installed
 openjdk-8-jre : Depends: openjdk-8-jre-headless (= 8u91-b14-0ubuntu4~16.04.1) but it is not installed
E: Unmet dependencies. Try using -f.