pour la prochaine fois...

# time urpmf /usr/share/xsessions/ 
plasma-mediacenter:/usr/share/xsessions/plasma-mediacenter.desktop
afterstep:/usr/share/xsessions/AfterStep.desktop
swm:/usr/share/xsessions/swm.desktop
spectrwm:/usr/share/xsessions/spectrwm.desktop
matchbox-desktop:/usr/share/xsessions/matchbox.desktop
fvwm-crystal:/usr/share/xsessions/fvwm-crystal.desktop
awesome:/usr/share/xsessions/awesome.desktop
fluxbox:/usr/share/xsessions/fluxbox.desktop
gnome-flashback:/usr/share/xsessions/gnome-flashback-metacity.desktop
windowmaker:/usr/share/xsessions/WindowMaker.desktop
sugar:/usr/share/xsessions/sugar.desktop
lxde-common:/usr/share/xsessions/LXDE.desktop
fvwm3:/usr/share/xsessions/fvwm3.desktop
enlightenment:/usr/share/xsessions/enlightenment.desktop
pekwm:/usr/share/xsessions/30Pekwm.desktop
dwm:/usr/share/xsessions/dwm.desktop
cinnamon:/usr/share/xsessions/cinnamon.desktop
cinnamon:/usr/share/xsessions/cinnamon2d.desktop
fvwm2:/usr/share/xsessions/fvwm2.desktop
mythtv-frontend:/usr/share/xsessions/mythfrontend.desktop
i3:/usr/share/xsessions/i3-with-shmlog.desktop
i3:/usr/share/xsessions/i3.desktop
lxqt-session:/usr/share/xsessions/lxqt.desktop
remmina:/usr/share/xsessions/remmina-gnome.desktop
gnome-session:/usr/share/xsessions/gnome-xorg.desktop
gnome-session:/usr/share/xsessions/gnome.desktop
gnome-classic-session:/usr/share/xsessions/gnome-classic-xorg.desktop
gnome-classic-session:/usr/share/xsessions/gnome-classic.desktop
openbox:/usr/share/xsessions/openbox.desktop
kodi:/usr/share/xsessions/kodi.desktop
liquidshell:/usr/share/xsessions/liquidshell-session.desktop
icewm-light:/usr/share/xsessions/icewm-session.desktop
icewm-light:/usr/share/xsessions/icewm.desktop
mate-session-manager:/usr/share/xsessions/mate.desktop
plasma-bigscreen:/usr/share/xsessions/plasma-bigscreen-x11.desktop
xfce4-session:/usr/share/xsessions/xfce.desktop
plasma-workspace:/usr/share/xsessions/01plasma.desktop
mythtv-frontend:/usr/share/xsessions/mythfrontend.desktop
kodi:/usr/share/xsessions/kodi.desktop
fluxbox:/usr/share/xsessions/fluxbox.desktop
spectrwm:/usr/share/xsessions/spectrwm.desktop
swm:/usr/share/xsessions/swm.desktop
fvwm-crystal:/usr/share/xsessions/fvwm-crystal.desktop
awesome:/usr/share/xsessions/awesome.desktop
plasma-mediacenter:/usr/share/xsessions/plasma-mediacenter.desktop
afterstep:/usr/share/xsessions/AfterStep.desktop
matchbox-desktop:/usr/share/xsessions/matchbox.desktop
gnome-flashback:/usr/share/xsessions/gnome-flashback-metacity.desktop
windowmaker:/usr/share/xsessions/WindowMaker.desktop
sugar:/usr/share/xsessions/sugar.desktop
lxde-common:/usr/share/xsessions/LXDE.desktop
fvwm3:/usr/share/xsessions/fvwm3.desktop
enlightenment:/usr/share/xsessions/enlightenment.desktop
pekwm:/usr/share/xsessions/30Pekwm.desktop
dwm:/usr/share/xsessions/dwm.desktop
cinnamon:/usr/share/xsessions/cinnamon.desktop
cinnamon:/usr/share/xsessions/cinnamon2d.desktop
fvwm2:/usr/share/xsessions/fvwm2.desktop
mythtv-frontend:/usr/share/xsessions/mythfrontend.desktop
i3:/usr/share/xsessions/i3-with-shmlog.desktop
i3:/usr/share/xsessions/i3.desktop
lxqt-session:/usr/share/xsessions/lxqt.desktop
remmina:/usr/share/xsessions/remmina-gnome.desktop
gnome-session:/usr/share/xsessions/gnome-xorg.desktop
gnome-session:/usr/share/xsessions/gnome.desktop
gnome-classic-session:/usr/share/xsessions/gnome-classic-xorg.desktop
gnome-classic-session:/usr/share/xsessions/gnome-classic.desktop
openbox:/usr/share/xsessions/openbox.desktop
kodi:/usr/share/xsessions/kodi.desktop
liquidshell:/usr/share/xsessions/liquidshell-session.desktop
icewm-light:/usr/share/xsessions/icewm-session.desktop
icewm-light:/usr/share/xsessions/icewm.desktop
mate-session-manager:/usr/share/xsessions/mate.desktop
plasma-bigscreen:/usr/share/xsessions/plasma-bigscreen-x11.desktop
xfce4-session:/usr/share/xsessions/xfce.desktop
plasma-workspace:/usr/share/xsessions/01plasma.desktop
mythtv-frontend:/usr/share/xsessions/mythfrontend.desktop
kodi:/usr/share/xsessions/kodi.desktop
real 0m9,783s
user 0m12,251s
sys 0m1,529s