prova:

· cambiare window manager

update-alternatives --config x-window-manager

esempio:

There are 6 alternatives which provide `x-window-manager'.

Selection Alternative
-----------------------------------------------
1 /usr/X11R6/bin/twm
+ 2 /usr/bin/wmaker
3 /usr/bin/larswm
4 /usr/bin/fluxbox
* 5 /usr/bin/xfwm
6 /usr/bin/icewm

Enter to keep the default[*], or type selection number: