Comment 2 for bug 789532

Quoting VarLogDistupgradeTermlog.gz:
> Setting up emacsen-common (1.4.19ubuntu2) ...
> emacsen-common: Handling install of emacsen flavor emacs
> install-info: No dir file specified; try --help for more information.
> dpkg: error processing emacsen-common (--configure):
> subprocess installed post-installation script returned error exit status 1

You appear to have a non-Ubuntu version of install-info, probably because you installed texlive at some point.

I will mark this bug as a duplicate of bug #630326; as a workaround, you can try to remove the rogue install-info from your path and retry the upgrade.

Your log file also contains a CUPS error near the end, but perhaps you already managed to resolve that independently.