First I have installed Ubuntu 15.10 on my HP pavilion touchscreen laptop and my touch is working properly on that but now on 14.04.
What I have to do for this, in order to make my touchscreen working on Ubuntu 14.04.
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You can install kernel from Ubuntu 15.10 that should support your touchscreen.
Run in terminal
sudo apt-get install linux-generic-lts-wily
and reboot when installation is finished.
You may need to install Broadcom wireless drivers from 15.10 source. Run
wget http://mirrors.kernel.org/ubuntu/pool/restricted/b/bcmwl/bcmwl-kernel-source_220.127.116.11+bdcom-0ubuntu7_amd64.deb sudo dpkg -i bcmwl-kernel-source_18.104.22.168+bdcom-0ubuntu7_amd64.deb