Correcting dependencies... failed.
The following packages have unmet dependencies.
 libmono-cil-dev : Depends: libmono-security4.0-cil (= 4.3.2.467-0xamarin2) but 4.2.2.30-0xamarin2 is installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
E: Unable to correct dependencies