I tried to install Kubuntu on an existing Ubuntu system using this command:
$ sudo apt install kubuntu-desktop
And I got this package dependency error:
You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: kde-telepathy-minimal : Depends: kde-config-telepathy-accounts (>= 15.04.0) but it is not going to be installed unity-scope-gdrive : Depends: account-plugin-google but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
sudo apt-get -f install would stop with the same dependency problem.
The key here is to realize that apt itself cannot resolve this cyclic dependency. So, to fix it we need to use a lower-level tool to explicitly take out the offending package. We can do that by using dpkg:
$ sudo dpkg --purge unity-scope-gdrive $ sudo dpkg --purge account-plugin-google $ sudo apt-get -f install
Tried with: Ubuntu 15.10