Comment 5 for bug 1368071

Furthermore, this seems to have been caused by xemacs21 which I believe is no longer supported on Ubuntu.

Setting up emacsen-common (2.0.7) ...
Installing new version of config file /etc/emacs/site-start.el ...
Install emacsen-common for xemacs21
emacsen-common: Handling install of emacsen flavor xemacs21

WARNING:
Couldn't find obvious defaults for:
data-directory
mule-lisp-directory
lisp-directory
Perhaps some directories don't exist, or the XEmacs executable,
/usr/bin/xemacs21
is in a strange place?Loading /usr/share/emacs/site-lisp/debian-startup...
Loading 00debian...
Error while loading 00debian: Symbol's function definition is void: loop
Loading 00debian-vars...
Loading 50dictionaries-common...
Error while loading 50dictionaries-common: No /usr/local/ prefixed paths in load-path
Symbol's function definition is void: dolist
xemacs exiting
.
ERROR: install script from emacsen-common package failed
dpkg: error processing package emacsen-common (--configure):
 subprocess installed post-installation script returned error exit status 1

(Copy/paste from VarLogDistupgradeApttermlog.gz line 13445f.)