In a terminal, cd to your Desktop
Then do
dpkg -i --force-downgrade xserver-xorg-input-evdev-dev_2.6.99.901-1ubuntu3~lp921236_all.deb
dpkg -i --force-downgrade xserver-xorg-input-evdev-udeb_2.6.99.901-1ubuntu3~lp921236_i386.udeb
dpkg -i --force-downgrade xserver-xorg-input-evdev_2.6.99.901-1ubuntu3~lp921236_i386.deb
In case it helps anyone else, here's how I get it to work again if I accidentally "upgrade" back to the broken version:
Download these files to your desktop
https:/ /launchpad. net/~sarvatt/ +archive/ sru1/+build/ 3118995/ +files/ xserver- xorg-input- evdev-dev_ 2.6.99. 901-1ubuntu3~ lp921236_ all.deb /launchpad. net/~sarvatt/ +archive/ sru1/+build/ 3118995/ +files/ xserver- xorg-input- evdev-udeb_ 2.6.99. 901-1ubuntu3~ lp921236_ i386.udeb /launchpad. net/~sarvatt/ +archive/ sru1/+build/ 3118995/ +files/ xserver- xorg-input- evdev_2. 6.99.901- 1ubuntu3~ lp921236_ i386.deb
https:/
https:/
In a terminal, cd to your Desktop xorg-input- evdev-dev_ 2.6.99. 901-1ubuntu3~ lp921236_ all.deb xorg-input- evdev-udeb_ 2.6.99. 901-1ubuntu3~ lp921236_ i386.udeb xorg-input- evdev_2. 6.99.901- 1ubuntu3~ lp921236_ i386.deb
Then do
dpkg -i --force-downgrade xserver-
dpkg -i --force-downgrade xserver-
dpkg -i --force-downgrade xserver-
Logout & log back in again
Then you can delete those downloaded files