[apt-get] erreur à chaque installation

Bonjour
Je suis sous Ubuntu Dapper Drake.
J'obtiens une erreur qui n'est pas fatale à l'installation, puisque je me la
traîne depuis quelques temps, mais que je l'ignorais généralement par
flemme... Et oui, c'est mon grand défaut.
Voila ce que m'affiche apt-get à chaque fois : (c'est un peu long, désolé)
Que dois-je faire pour qu'elle n'apparaisse plus ?
Petite remarque en passant : le package installé n'a aucun rapport avec tout
ce qui est listé, le dernier étant flight-of-the-amazon-queen
Merci d'avance

Wrote /usr/share/emacs21/site-lisp/ada-mode/ada-mode.elc
Wrote /usr/share/emacs21/site-lisp/ada-mode/ada-prj.elc
Wrote /usr/share/emacs21/site-lisp/ada-mode/ada-stmt.elc
While compiling ada-read-identifier in file
/usr/share/emacs21/site-lisp/ada-mod e/ada-xref.el:
** Attempt to inline `ada-in-comment-p' before it was defined
** Attempt to inline `ada-in-string-p' before it was defined
While compiling ada-xref-search-nearest in file
/usr/share/emacs21/site-lisp/ada -mode/ada-xref.el:
** Attempt to inline `ada-in-string-or-comment-p' before it was defined
** Attempt to inline `ada-goto-previous-word' before it was defined
Wrote /usr/share/emacs21/site-lisp/ada-mode/ada-xref.elc
Wrote /usr/share/emacs21/site-lisp/ada-mode/ada-vms.elc
Wrote /usr/share/emacs21/site-lisp/ada-mode/ada-support.elc
Wrote /usr/share/emacs21/site-lisp/ada-mode/cua-mode.elc
Done
Wrote /usr/share/emacs21/site-lisp/dictionaries-common/debian-ispell.elc
Wrote /usr/share/emacs21/site-lisp/dictionaries-common/ispell.elc
Wrote /usr/share/emacs21/site-lisp/dictionaries-common/flyspell.elc
Done
Wrote /usr/share/emacs21/site-lisp/dictionary-el/connection.elc
Source file `/usr/share/emacs21/site-lisp/dictionary-el/link.el' newer than
byte -compiled file
Wrote /usr/share/emacs21/site-lisp/dictionary-el/dictionary.elc
Wrote /usr/share/emacs21/site-lisp/dictionary-el/dictionary-init.elc
Wrote /usr/share/emacs21/site-lisp/dictionary-el/install-package.elc
Wrote /usr/share/emacs21/site-lisp/dictionary-el/link.elc
Wrote /usr/share/emacs21/site-lisp/dictionary-el/lpath.elc
Done
Loading 00debian-vars (source)...
Loading 50ada-mode (source)...
Loading 50auctex (source)...
Loading 50autoconf (source)...
Loading 50devhelp (source)...
Loading 50dictionaries-common (source)...
Loading debian-ispell...
Loading /var/cache/dictionaries-common/emacsen-ispell-default.el (source)...
Loading /var/cache/dictionaries-common/emacsen-ispell-dicts.el (source)...
Loading 50dictionary-el (source)...
Loading dictionary-init...
Loading 50eieio (source)...
Loading 50emacs-goodies-el (source)...
Error while loading 50emacs-goodies-el
Loading 50emacs-goodies-extra-el (source)...
Loading 50emacs-intl-fonts (source)...
Loading 50erlang (source)...
Error while loading 50erlang
Loading 50festival (source)...
Loading 50rdtool-elisp (source)...
Loading 50ruby1.8-elisp (source)...
Loading 50tuareg-mode (source)...
Loading 51tuareg-mode (source)...
Loading 55doxymacs (source)...
Source file `/usr/share/emacs21/site-lisp/doxymacs/xml-parse.el' newer than
byte -compiled file
Error while loading 55doxymacs
Source file `/usr/share/emacs21/site-lisp/doxymacs/xml-parse.el' newer than
byte -compiled file
While compiling toplevel forms in file
/usr/share/emacs21/site-lisp/doxymacs/dox ymacs.el:
!! File error (("Cannot open load file" "url"))
Wrote /usr/share/emacs21/site-lisp/doxymacs/xml-parse.elc
Done
emacs-install: /usr/lib/emacsen-common/packages/install/doxymacs emacs21
xemacs2 1 failed at /usr/lib/emacsen-common/emacs-install line 28, <TSORT>
line 10.
dpkg : erreur de traitement de emacs21 (--configure) :
le sous-processus post-installation script a retourné une erreur de sortie
d'ét at 1
Des erreurs ont été rencontrées pendant l'exécution :
emacs21
E: Sub-process /usr/bin/dpkg returned an error code (1)


--
Julien