Linux Administration Cookbook

Apt's conflict solution

The following is an example of Apt detecting dependency problems and refusing to carry on with an installation:

$ sudo apt install postfix exim4-baseReading package lists... DoneBuilding dependency tree       Reading state information... DoneSome packages could not be installed. This may mean that you haverequested an impossible situation or if you are using the unstabledistribution that some required packages have not yet been createdor been moved out of Incoming.The following information may help to resolve the situation:The following packages have unmet dependencies: exim4-base : Depends: exim4-config (>= 4.82) but it is not going to be installed or                       exim4-config-2E: Unable to correct problems, you have held broken packages. ...