bug found: see https://bugs.freedesktop.org/show_bug.cgi?id=95171 ,
https://lists.x.org/archives/xorg-devel/2016-April/049504.html

patch: see https://lists.x.org/archives/xorg-
devel/2016-April/049504.html

diff that caused it: (to fix, apply in reverse)
-----
diff --unified=2 -r 
/home/administrator/xserver-xorg-input-synaptics-lts-utopic-1.8.1/src/ 
/home/administrator/xserver-xorg-input-synaptics-lts-xenial-1.8.2/src/
#[...]
--- 
/home/administrator/xserver-xorg-input-synaptics-lts-utopic-1.8.1/src/synaptics.c
   2016-09-26 08:30:04.000000000 -0700
+++ 
/home/administrator/xserver-xorg-input-synaptics-lts-xenial-1.8.2/src/synaptics.c
   2015-03-26 18:22:09.000000000 -0700
@@ -672,5 +672,5 @@
     pars->tap_time = xf86SetIntOption(opts, "MaxTapTime", 180);
     pars->tap_move = xf86SetIntOption(opts, "MaxTapMove", tapMove);
-    pars->tap_time_2 = xf86SetIntOption(opts, "MaxDoubleTapTime", 180);
+    pars->tap_time_2 = xf86SetIntOption(opts, "MaxDoubleTapTime", 100);
     pars->click_time = xf86SetIntOption(opts, "ClickTime", 100);
     pars->clickpad = xf86SetBoolOption(opts, "ClickPad", pars->clickpad);      
 /* Probed */
#[...]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1615204

Title:
  select-by-word/double-click drag-select only works if tap very fast

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