Upgrading from 14.04 to 16.04 broke my GUI, and I cannot run apt because of a problem with
libstdc++ like in this question.
I downloaded a deb package from here like advised but I cannot install it with dpkg because
installing libstdc++6:amd64 would break libboost-date-time1.55.0:amd64, and deconfiguration is not permitted (--auto-deconfigure might help)
What should I do? Do I run dpkg with