sudo apt-get update && sudo apt-get dist-upgrade

The following packages have unmet dependencies:
 lsb-base : Breaks: upstart (< 1.12.1-0ubuntu8)
            Breaks: upstart:i386 (< 1.12.1-0ubuntu8)
 plymouth : Depends: initramfs-tools but it is not going to be installed
            Recommends: plymouth-theme-ubuntu-text but it is not going to be installed or
                        plymouth-theme
 udev : Depends: initramfs-tools (>= 0.92bubuntu63) but it is not going to be installed
        Depends: util-linux (> 2.15~rc2)
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.