$: apt-get dist-upgrade
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: airvpn : Depends: libmono-system-runtime2.0-cil but it is not installable Depends: libmono-winforms2.0-cil but it is not installable Depends: libmono-corlib2.0-cil but it is not installable E: Unmet dependencies. Try using -f.