boot to the GRUB menu choose Advanced Options choose Recovery mode choose dpkg - fix broken packages let it try to finish the aborted upgrade https://wiki.ubuntulinux.jp/UbuntuTips/Others/RecoveryMode

Open /etc/NetworkManager/NetworkManager.conf in an editor with root rights. Delete (or comment out with a hash #) the line that reads dns=dnsmasq. Restart NetworkManager via sudo service NetworkManager restart.