[Trisquel-users] Re : Screen tearing and high CPU

[lcerf]

There is no perfect recipe (otherwise, APT would automatically follow it). I  
guess the lower-level the package the more likely it is the source of the  
mess. Synaptic is not low-level. I would try to remove the broken Xfce  
packages, see if that solves everything and, if so, try to reinstall Xfce  
properly.