mhmm par dpkg il suffirai de connaitre le nom du paquet. tu peux les lister avec un dpkg -l
ensuite tu peux fouiner dans la list avec dpkg -l |grep monpaque*
ensuite: aptitude remove monpaquet
Oui oui, c’est bien gentil, je l’ai fait, mais aucun paquet ne veut vraiment se désinstaller complètement, à cause d’erreurs avec l’installation de compiz. Or compiz, je ne peux le réinstaller correctement, à cause d’erreurs avec libgtk, et libgtk ne veut pas se désinstaller! 
donne voire la sortie de aptitude remove -s nomdupaquet
le paramettre -s permet de faire une simulation tu risque rien 
je pense que c est le paquet que t’a installer qui fou la M…
Je donne d’abord la sortie de apt-get upgrade. La voilà:
Reading package lists...
Building dependency tree...
Reading state information...
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
3 not fully installed or removed.
After this operation, 0B of additional disk space will be used.
Do you want to continue [Y/n]? Setting up compiz-gtk (0.7.6-7) ...
gconftool-2: symbol lookup error: gconftool-2: undefined symbol: g_option_context_new
dpkg: error processing compiz-gtk (--configure):
subprocess post-installation script returned error exit status 127
Setting up compiz-plugins (0.7.6-7) ...
gconftool-2: symbol lookup error: gconftool-2: undefined symbol: g_option_context_new
dpkg: error processing compiz-plugins (--configure):
subprocess post-installation script returned error exit status 127
Setting up system-tools-backends (2.6.0-2lenny3) ...
Reloading system message bus config...done.
Starting System Tools Backends: system-tools-backends/usr/bin/system-tools-backends: symbol lookup error: /usr/lib/libgio-2.0.so.0: undefined symbol: g_thread_gettime
invoke-rc.d: initscript system-tools-backends, action "start" failed.
dpkg: error processing system-tools-backends (--configure):
subprocess post-installation script returned error exit status 127
Errors were encountered while processing:
compiz-gtk
compiz-plugins
system-tools-backends
hello
difficile a dire comme sa, ces trois pakage tu peux pas les supprimer ?? parce que j’ai pas demander l’upgrade mai la suppression avec l’option -s
system-tools-backends va toucher a gnome, donc si tu est sous gnome il faudrait probablement ré-installer
Bon.
1.aptitude update.
Ensuite
2.- aptitude remove --purge system-tools-backends -s
si sa passe pas essaye avec apt-get remove -s system-tools-backends , sa gère moins les dépendances.
si sa passe toujours pas ajoute -f (très mauvais mai bon … )
(oublie pas le -s a chaque commande sauf le update)
colle les 3 résulta ici
pour compize on verra plus tard s’il est dés-installer c’est pas grave (note garde aux chaud un xorg.conf sans compiz)
Ca me donne ceci.
Reading package lists...
Building dependency tree...
Reading state information...
Reading extended state information...
Initializing package states...
Reading task descriptions...
The following packages are BROKEN:
gnome-system-tools liboobs-1-4
The following packages will be REMOVED:
system-tools-backends
The following partially installed packages will be configured:
compiz-gtk compiz-plugins
0 packages upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
Need to get 0B of archives. After unpacking 819kB will be freed.
The following packages have unmet dependencies:
liboobs-1-4: Depends: system-tools-backends (>= 2.5.4) but it is not installable
gnome-system-tools: Depends: system-tools-backends but it is not installable
The following actions will resolve these dependencies:
Remove the following packages:
fast-user-switch-applet
gnome
gnome-accessibility
gnome-applets
gnome-core
gnome-desktop-environment
gnome-network-admin
gnome-system-tools
liboobs-1-4
Leave the following dependencies unresolved:
gnome-panel recommends gnome-applets (>= 2.12.1-1)
Score is -1689
Accept this solution? [Y/n/q/?] The following packages will be REMOVED:
alacarte{pu} arj{pu} aspell{pu} at-spi{pu} bluez-gnome{pu}
capplets-data{pu} cheese{pu} dasher{pu} dasher-data{pu}
deskbar-applet{pu} desktop-file-utils{pu} dmz-cursor-theme{pu} ekiga{pu}
eog{pu} espeak-data{pu} evolution-exchange{pu} fast-user-switch-applet{a}
file-roller{pu} finger{pu} gcalctool{pu} gconf-editor{pu} gdm{pu}
gdm-themes{pu} gedit{pu} gedit-common{pu} gnome{a} gnome-about{pu}
gnome-accessibility{a} gnome-accessibility-themes{pu} gnome-applets{a}
gnome-applets-data{pu} gnome-backgrounds{pu} gnome-cards-data{pu}
gnome-control-center{pu} gnome-core{a} gnome-desktop-environment{a}
gnome-games{pu} gnome-games-data{pu} gnome-mag{pu} gnome-menus{pu}
gnome-netstatus-applet{pu} gnome-nettool{pu} gnome-network-admin{a}
gnome-orca{pu} gnome-panel{pu} gnome-panel-data{pu}
gnome-power-manager{pu} gnome-screensaver{pu} gnome-session{pu}
gnome-spell{pu} gnome-system-monitor{pu} gnome-system-tools{a}
gnome-themes{pu} gnome-themes-extras{pu} gnome-user-guide{pu}
gnome-utils{pu} gnome-vfs-obexftp{pu} gnome-volume-manager{pu}
gnuchess{pu} gok{pu} gstreamer0.10-tools{pu} gtk2-engines{pu}
gtk2-engines-pixbuf{pu} gucharmap{pu} guile-1.8-libs{pu} libapm1{pu}
libatspi1.0-0{pu} libavahi-ui0{pu} libbrlapi0.5{pu} libcolorblind0{pu}
libcupsys2{pu} libdmx1{pu} libespeak1{pu} libexempi3{pu}
libgail-gnome-module{pu} libgda3-3{pu} libgda3-common{pu} libgdl-1-0{pu}
libgdl-1-common{pu} libggz2{pu} libggzcore9{pu} libggzmod4{pu}
libgksu1.2-0{pu} libgksuui1.0-1{pu} libgnome-mag2{pu}
libgnome-speech7{pu} libgnome-window-settings1{pu} libgnomekbdui2{pu}
libgnomevfs2-bin{pu} libgpod3{pu} libgucharmap6{pu}
libgweather-common{pu} libgweather1{pu} libiw29{pu} libmtp7{pu}
libnet-dbus-perl{pu} liboobs-1-4{a} libopal-2.2{pu} libopenobex1{pu}
libportaudio2{pu} libpt-1.10.10{pu} libpt-1.10.10-plugins-alsa{pu}
libpt-1.10.10-plugins-v4l{pu} libslab0{pu} libspeexdsp1{pu} libxevie1{pu}
libxss1{pu} metacity{pu} mousetweaks{pu} nautilus{pu}
nautilus-cd-burner{pu} nautilus-data{pu} p7zip{pu} python-4suite-xml{pu}
python-brlapi{pu} python-cups{pu} python-cupsutils{pu}
python-eggtrayicon{pu} python-gmenu{pu} python-gnome2-extras{pu}
python-gtksourceview2{pu} python-notify{pu} python-pyatspi{pu}
rhythmbox{pu} serpentine{pu} sound-juicer{pu} swfdec-gnome{pu}
system-config-printer{pu} system-tools-backends transmission-common{pu}
transmission-gtk{pu} vinagre{pu} vino{pu} zenity{pu}
The following partially installed packages will be configured:
compiz-gtk compiz-plugins
0 packages upgraded, 0 newly installed, 134 to remove and 0 not upgraded.
Need to get 0B of archives. After unpacking 465MB will be freed.
Do you want to continue? [Y/n/?] Would download/install/remove packages.
Je le fais ``pour de vrai?’’