Problème avec l installation de gimp

Bonjour,
j'avais gimp2.6 j'ai voulu passer a gimp2.8 en suivant se topic
je suis sous ubuntu 12.04


http://forum.ubuntu-fr.org/viewtopic.php?pid=9279861

j ai rentrer ces deux ligne de commande

sudo apt-add-repository ppa:otto-kesselgulasch/gimp
sudo apt-get update && sudo apt-get install gimp

et maintenant quand je lance gimp
ca met a la place

Libgimp version mismatch!

The GIMP binary cannot run with a libgimp version
other than its own. This is GIMP 2.6.12, but the
libgimp version is 2.8.0.

Maybe you have GIMP versions in both /usr and /usr/local ?



j ai fait sudo apt-get install -f

comme conseiller par ubuntu mais rien ne change et quand je vais dans la logitheque il me propose de reparer mais ca ne fonctionne pas voici le detail de l erreur

installArchives() failed: (Reading database ...
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 231668 files and directories currently installed.)
Preparing to replace gimp 2.6.12-1ubuntu1 (using .../gimp_2.8.0-1ubuntu0ppa4~precise_i386.deb) ...
Unpacking replacement gimp ...
dpkg: error processing /var/cache/apt/archives/gimp_2.8.0-1ubuntu0ppa4~precise_i386.deb (--unpack):
trying to overwrite '/usr/lib/gimp/2.0/plug-ins/file-xmc', which is also in package gimp-plugin-registry 3.5.4-1
No apport report written because MaxReports is reached already
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Processing triggers for menu ...
Errors were encountered while processing:
/var/cache/apt/archives/gimp_2.8.0-1ubuntu0ppa4~precise_i386.deb
Setting up libgimp2.0 (2.8.0-1ubuntu0ppa4~precise) ...
Setting up gimp-data (2.8.0-1ubuntu0ppa4~precise) ...
Installing new version of config file /etc/gimp/2.0/gimprc ...
Installing new version of config file /etc/gimp/2.0/sessionrc ...
Installing new version of config file /etc/gimp/2.0/gtkrc ...
Installing new version of config file /etc/gimp/2.0/menurc ...
Setting up libopenraw1 (0.0.8-3build1) ...
Setting up libbabl-0.1-0 (0.1.10-4precise0~ppa) ...
Setting up libgegl-0.2-0 (0.2.0-4precise0~ppa) ...
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place

es ce que quelqu un a une idee svp?