Error actualizando el paquete ubufox - Error upgrading the ubufox package

Hoy me he desayunado con una actualización de Ubuntu/Kubuntu que no quería funcionar. Días atrás el sistema actualizó Mozilla Firefox de su versión 4 a la 5 (otros que han entrado en la carrera de las release versions) y funcionó a la perfección, pero hoy, al actualizar el paquete ubufox obtenía el siguiente error:

bdispatcher@laptop:~$ sudo apt-get upgrade
Leyendo lista de paquetes... Hecho
Creando árbol de dependencias      
Leyendo la información de estado... Hecho
Se actualizarán los siguientes paquetes:
  ubufox
1 actualizados, 0 se instalarán, 0 para eliminar y 0 no actualizados.
8 no instalados del todo o eliminados.
Se necesita descargar 0B/58,3kB de archivos.
Se utilizarán 319kB de espacio de disco adicional después de esta operación.
¿Desea continuar [S/n]? s
(Leyendo la base de datos ...  00%
209465 ficheros y directorios instalados actualmente.)
Preparando para reemplazar ubufox 0.9-0ubuntu1~mfs~lucid1 (usando .../ubufox_0.9.1-0ubuntu0.10.04.1~mfn3_all.deb) ...
Desempaquetando el reemplazo de ubufox ...
dpkg: error al procesar /var/cache/apt/archives/ubufox_0.9.1-0ubuntu0.10.04.1~mfn3_all.deb (--unpack):
 intentando sobreescribir `/etc/xul-ext/ubufox.js', que está también en el paquete xul-ext-ubufox 0:0.9-0ubuntu1~mfs~lucid1
Se encontraron errores al procesar:
 /var/cache/apt/archives/ubufox_0.9.1-0ubuntu0.10.04.1~mfn3_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

Según creo entender, parece que a los mantenedores los paquetes ubufox y xul-ext-ubufox se les ha colado el fichero /etc/xul-ext/ubufox.js, y no gestionan bien la existencia del mismo.

Así que ante mi desconocimiento, he mirado a ver que era dada uno de estos paquetes:

bdispatcher@laptop:~$ apt-cache show ubufox

Package: ubufox
Priority: optional
Section: web
Installed-Size: 352
Maintainer: Ubuntu Mozilla Team <ubuntu-mozillateam@lists.ubuntu.com>
Architecture: all
Version: 0.9.1-0ubuntu0.10.04.1~mfn3
Recommends: firefox | abrowser
Provides: abrowser-ubufox, firefox-ubufox, xul-ext-ubufox
Depends: apturl (>= 0.1.2ubuntu1) | apturl-kde
Enhances: abrowser, firefox
Filename: pool/main/u/ubufox/ubufox_0.9.1-0ubuntu0.10.04.1~mfn3_all.deb
Size: 58306
MD5sum: 5e1b720cd3562e9c014d5e40c7aaccfa
SHA1: 81b36748905c704d62ab34c39856dc9f942836a4
Description: Ubuntu Firefox specific configuration defaults and apt support
 Extension package for Firefox provides ubuntu specific configuration defaults
 as well as apt support for firefox plugins/extensions.
 .
 You can uninstall this package if you prefer to use a pristine firefox
 install.
[...]

bdispatcher@laptop:~$ apt-cache show xul-ext-ubufox
Package: xul-ext-ubufox
Source: ubufox
Priority: optional
Section: web
Installed-Size: 336
Maintainer: Ubuntu Mozilla Team <ubuntu-mozillateam@lists.ubuntu.com>
Architecture: all
Version: 0.9-0ubuntu1~mfs~lucid1
Recommends: firefox | abrowser
Replaces: ubufox (<< 0.9~rc2-0ubuntu3)
Provides: abrowser-ubufox, firefox-ubufox, ubufox
Depends: apturl (>= 0.1.2ubuntu1) | apturl-kde
Enhances: abrowser, firefox
Breaks: ubufox (<< 0.9~rc2-0ubuntu3)
Filename: pool/main/u/ubufox/xul-ext-ubufox_0.9-0ubuntu1~mfs~lucid1_all.deb
Size: 55138
MD5sum: Descriptionfbabfde31f15e6db5c665f975716db5f
SHA1: 22127c90b755a83139cf80b007a6c94e0d296878
Description: Ubuntu-specific configuration defaults and apt support for Firefox
 Adds Ubuntu-specific modifications to Firefox.
 .
 Integrates the browser with Ubuntu to:
 * Enable searching for missing plugins from Ubuntu software catalog
 * Add the following options to the Help menu
 - Get help on-line
 - Help translating Firefox
 - Ubuntu Release Notes
 * Set homepage to Ubuntu Start Page
 * Display a restart notification after upgrading Firefox
 * Add ask.com to the search engines.
 .
 You can uninstall this if you prefer to use a pristine Firefox install

Así que visto lo visto, pensando que pudiendo prescindir de los dos, si tengo que elegir uno a eliminar es xul-ext-ubufox, y entendiendo que este error de dependencias lo subsanarán más bien pronto, procedo a desinstalarlo.

sudo apt-get remove xul-ext-ubufox

Ahora ya se instala ubufox sin problema.

Last days my Ubuntu/Kubuntu laptop had updated the Mozilla Firefox from the 4 to 5 release version (It seems that they had joined the release version race too).

Today I had to deal with the following error update the ubufox package:

bdispatcher@laptop:~$ sudo apt-get upgrade
Reading package list... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
  ubufox
1 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
8 not fully installed or removed.
Ned to get 0B/58,3kB de archives.
After unpaking 319kB of additional space will be used.
Do you want to continue [Y/n]? y
(Reading database ...  00%
209465 files and directories currently installed.)
Preparing to replace ubufox 0.9-0ubuntu1~mfs~lucid1 (using .../ubufox_0.9.1-0ubuntu0.10.04.1~mfn3_all.deb) ...
Unpacking replacement ubufox ...
dpkg: error proccessing /var/cache/apt/archives/ubufox_0.9.1-0ubuntu0.10.04.1~mfn3_all.deb (--unpack):
 trying to overwrite `/etc/xul-ext/ubufox.js', which is also in package xul-ext-ubufox 0:0.9-0ubuntu1~mfs~lucid1
Error were encountered while processing:
 /var/cache/apt/archives/ubufox_0.9.1-0ubuntu0.10.04.1~mfn3_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

In my opinion the mantainer had made a little mistake with the file /etc/xul-ext/ubufox.js, in the ubufox and the xul-ext-ubufox packages.

So I took a look to get some info of this packages:

bdispatcher@laptop:~$ apt-cache show ubufox

Package: ubufox
Priority: optional
Section: web
Installed-Size: 352
Maintainer: Ubuntu Mozilla Team <ubuntu-mozillateam@lists.ubuntu.com>
Architecture: all
Version: 0.9.1-0ubuntu0.10.04.1~mfn3
Recommends: firefox | abrowser
Provides: abrowser-ubufox, firefox-ubufox, xul-ext-ubufox
Depends: apturl (>= 0.1.2ubuntu1) | apturl-kde
Enhances: abrowser, firefox
Filename: pool/main/u/ubufox/ubufox_0.9.1-0ubuntu0.10.04.1~mfn3_all.deb
Size: 58306
MD5sum: 5e1b720cd3562e9c014d5e40c7aaccfa
SHA1: 81b36748905c704d62ab34c39856dc9f942836a4
Description: Ubuntu Firefox specific configuration defaults and apt support
 Extension package for Firefox provides ubuntu specific configuration defaults
 as well as apt support for firefox plugins/extensions.
 .
 You can uninstall this package if you prefer to use a pristine firefox
 install.
[...]

bdispatcher@laptop:~$ apt-cache show xul-ext-ubufox
Package: xul-ext-ubufox
Source: ubufox
Priority: optional
Section: web
Installed-Size: 336
Maintainer: Ubuntu Mozilla Team <ubuntu-mozillateam@lists.ubuntu.com>
Architecture: all
Version: 0.9-0ubuntu1~mfs~lucid1
Recommends: firefox | abrowser
Replaces: ubufox (<< 0.9~rc2-0ubuntu3)
Provides: abrowser-ubufox, firefox-ubufox, ubufox
Depends: apturl (>= 0.1.2ubuntu1) | apturl-kde
Enhances: abrowser, firefox
Breaks: ubufox (<< 0.9~rc2-0ubuntu3)
Filename: pool/main/u/ubufox/xul-ext-ubufox_0.9-0ubuntu1~mfs~lucid1_all.deb
Size: 55138
MD5sum: Descriptionfbabfde31f15e6db5c665f975716db5f
SHA1: 22127c90b755a83139cf80b007a6c94e0d296878
Description: Ubuntu-specific configuration defaults and apt support for Firefox
 Adds Ubuntu-specific modifications to Firefox.
 .
 Integrates the browser with Ubuntu to:
 * Enable searching for missing plugins from Ubuntu software catalog
 * Add the following options to the Help menu
 - Get help on-line
 - Help translating Firefox
 - Ubuntu Release Notes
 * Set homepage to Ubuntu Start Page
 * Display a restart notification after upgrading Firefox
 * Add ask.com to the search engines.
 .
 You can uninstall this if you prefer to use a pristine Firefox install

No I have some more info about these packages I decide to remove the xul-ext-ubufox, while wait to the maintainer solution:

sudo apt-get remove xul-ext-ubufox

Now you can install ubufox without any problem.

PS. I know, I know. My English is not good enought but, the more you help me, the more I learn.

Editando:
He seguido leyendo y he encontrado esta otra solución:
1.- busca dentro de la caché de tu sistema el paquete ubufox:
find /var/cache/apt/ -name "ubufox*"

2.- instálalo con este comando:
sudo dpkg -i --force-overwrite _path_to_ubufox_package

3.- repara las dependencias:
sudo apt-get install -f

Y listo!!

Edditing:
I kept on reading and found another solution.
1.- look for the ubufox package into your system cache folder:
find /var/cache/apt/ -name "ubufox*"

2.- install the package using this command:
sudo dpkg -i --force-overwrite _path_to_ubufox_package

3.- run the following command to fix dependencies:
sudo apt-get install -f

And it's done!!!