I have 16:04 installed in laptop. Touchscreen of my laptop doesn't work with this distribution. With 14.04 ,it was working, even with 15.10 it worked. But with 16.04 it doesn't work. In my WIndows 10 partition it works fine. So I logged a bug request and team ubuntu told me
"try bisecting with mainline kernel builds, 15.04 had 3.19 so it regressed between it and 4.4."
I don't know how to do that. Can anyone tell me how to perform and report it back to them so that my problem get resolved.