Question: I have a Sony VAIO VPCF22S1E. I just upgraded from 11.04 to 11.10 . While upgrading (on downloading packages step) I lost my internet connection and 2-3 minutes later it resumed. I continued to download packages. And finally, upgrading is completed. Now I'm using 11.10 . But when I log in to Ubuntu after 2 minutes the touchpad will be unresponsive. I can't use it or the integrated buttons. 

The **Disable touchpad while typing** option is turned off (suggested from [this answer](https://askubuntu.com/questions/66081/touchpad-gets-disabled-after-sometime-after-login/66142#66142)) but it did not solve the problem.

How can I sure my packages downloaded and installed successfully? (As I said, I lost my connection while downloading packages)

*PS: I can use USB mouse.*

*PPS: I have tried `apt-get update` , `apt-get upgrade`*

Answer: 
Here is a fix worked for first reboot but **now it's not working** :

1. Edit `/etc/default/grub` to include `GRUB_CMDLINE_LINUX=”i8042.nopnp”`
2. Run: `sudo update-grub`
3. Reboot.
Turn off disable touchpad while typing in mouse options and reboot.