So, I've been dealing with this problem for a while and decided to do something about it today. I'm dual booting Ubuntu 16.04 and Windows 10 on a Lenovo Yoga 13, and about half the time when I do a "hard click", that is, when I actually depress the left half of the touchpad until it clicks, it will react as if I've double clicked and registers two ButtonPress events according to xev. This is apparently a common problem in external mice, called "bouncing" or "rubbing" (via here), but I don't know what to do when it's a problem with the touchpad.
I first tried changing the settings through the Unity Mouse options and learned that by setting my double-click speed to absurdly high, I can get it to register as two separate single-clicks rather than a double-click, but that didn't solve the problem of the mouse bouncing. I then tried some of the settings in synclient (e.g. MaxTapTime, SingleTapTimeout, ClickTime) and tried to change the setting for "TouchpadOff" (it's currently set at 2 and I tried synclient TouchpadOff=0) to no effect.
After reading through some of the man pages and xorg documentation, I've learned that there's an option in some prior versions to disable "FastTaps", which sounds like it could be part of the problem. Any advice on this is welcome, and I'd actually settle for disabling the option to hard click the touchpad entirely (synclient ClickPad=0 didn't do it).
Other notes for diagnosis: If I hard click the right side of the touchpad to perform a right click, it'll record me right clicking then immediately left clicking. All "soft clicks" work perfectly, no bouncing. This has been a problem since I first installed Ubuntu 16.04, and I haven't tried any earlier versions on this laptop. This is never a problem in Windows.
This is my first post on askubuntu (woo!) and I'm not extremely familiar with Linux yet, so brownie points will go towards anyone who can explain what they're doing in essentially layman's terms.
sudo apt install xserver-xorg-input-libinputant test how it works there. You need to reboot to get it working. tapping that you call "soft clicks" will be disabled by default, but can be enabled later.
sudo apt install xserver-xorg-input-libinput-hwe-16.04instead.