communal@communal:~$ sudo apt-get install -f aptitude
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:
 aptitude : Depends: aptitude-common (= 0.6.8.2-1ubuntu4) but it is not going to be installed
            Depends: libboost-iostreams1.54.0 but it is not going to be installed
            Depends: libcwidget3 but it is not going to be installed
            Depends: libept1.4.12 but it is not going to be installed
 linux-generic-lts-vivid : Depends: linux-headers-generic-lts-vivid (= 3.19.0.49.34) but 3.19.0.25.12 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
communal@communal:~$ sudo apt-get install -f aptitude
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:
 aptitude : Depends: aptitude-common (= 0.6.8.2-1ubuntu4) but it is not going to be installed
            Depends: libboost-iostreams1.54.0 but it is not going to be installed
            Depends: libcwidget3 but it is not going to be installed
            Depends: libept1.4.12 but it is not going to be installed
 linux-generic-lts-vivid : Depends: linux-headers-generic-lts-vivid (= 3.19.0.49.34) but 3.19.0.25.12 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
communal@communal:~$ sudo apt-get install -f aptitude