Comment 3 for bug 281308

I had this problem as well. I suspect it is more of an issue with dist-upgrade than xorg itself. I have since resolved the issue. It occurred in the same upgrade to xinput 1.3.0-1ubuntu3, which I think may have caused the problem with the dist-upgrade.

As Bruce Cowan mentioned, the problem is that xserver-xorg depends on xserver-xorg-input-all | xserver-xorg-input-2.1 , and the dist upgrade decided to remove xserver-xorg-input-all , -evdev and -synaptics. Because other installed packages still provided xserver-xorg-input-2.1 (eg. -wacom), dependency checking worked out ok, while removing the critical -evdev package.

Installing xserver-xorg-input-all again resolved the problem.