I am still able to use a mouse however, but the touchpad will not respond. Toggling the on/off button for the trackpad on my keyboard does not change anything. I haven't seen anything that permanently fixes it.
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I had the same problem. Apparently the Intel Graphics Installer automatically uninstalled the package xserver-xorg-input-synaptics. Reinstalling this package should re-enable your touchpad.
Refer to this post: Touchpad stopped working out of the blue
zirydy
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Does it uninstall any other packages or programs that I should want to keep asides from the trackpad? – gotta-ask-fast Mar 02 '15 at 07:23
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Try switch back to packages on the main repos rather than the Intel repos.
To do this, follow the instructions at http://www.webupd8.org/2013/11/how-to-downgrade-proposed-repository.html
Just change saucy to trusty, and consider the proposed repo to be the Intel repo [which lives in other software]
If you need any help, say so in the comments of this answer