I faced this problem. Touchpad of my Dell Laptop was working in Windows 7 but not in Ubuntu 12.04 . I gave the following commands and it started working.
1. Become root.
2. Give your laptop password.
Then give the following two commands.
In these,first command is removing psmouse (/lib/modules/3.2.0-27-generic-pae/kernel/drivers/input/mouse/psmouse.ko
#modprobe -r psmouse #modprobe psmouse proto=imps
To make this change permanent, create a file such as
/etc/modprobe.d/, and put the following line in it:
options psmouse proto=imps
Thats all 🙂