Hello,
I first tried to install the kernak using the instructions as you provided, but 
it complained about missing libssl** package, which I installed, leading to 
another complain of missing '  linux-headers-4.19.0' package.

After bit of googling to find this package, I ended up to install the
latest 4.19 Kernal following the instructions of this page [1], here is
the information of my latest kernal [2] and here is the output of trying
to install the 4.19**generaic*.deb package, the Kernal remains same as
before [2].

Anyways, I did reboot the system and it unfortunately did not change
anything. The mouse behavior is still the same as before. Here is the
output of [3] xinpout --list-props 12


[1] http://www.theubuntumaniac.com/2018/09/install-update-linux-
kernel-419-rc3-on.html

[2]
***************************
pooja@X1-Carbon-6:~/Desktop$ uname -r
4.19.0-041900rc3-lowlatency
pooja@X1-Carbon-6:~/Desktop$ uname -a

[2]
***************************
pooja@X1-Carbon-6:~/Desktop$  sudo dpkg -i 
linux-modules-4.19.0-041900rc3-generic_4.19.0-041900rc3.201809120832_amd64.deb
(Reading database ... 281748 files and directories currently installed.)
Preparing to unpack 
linux-modules-4.19.0-041900rc3-generic_4.19.0-041900rc3.201809120832_amd64.deb 
...
Unpacking linux-modules-4.19.0-041900rc3-generic 
(4.19.0-041900rc3.201809120832) over (4.19.0-041900rc3.201809120832) ...
Setting up linux-modules-4.19.0-041900rc3-generic 
(4.19.0-041900rc3.201809120832) ...
Processing triggers for linux-image-unsigned-4.19.0-041900rc3-generic 
(4.19.0-041900rc3.201809120832) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-4.19.0-041900rc3-generic
W: Possible missing firmware /lib/firmware/i915/skl_dmc_ver1_27.bin for module 
i915
W: Possible missing firmware /lib/firmware/i915/kbl_dmc_ver1_04.bin for module 
i915
W: Possible missing firmware /lib/firmware/i915/cnl_dmc_ver1_07.bin for module 
i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_39.bin for module 
i915
W: Possible missing firmware /lib/firmware/i915/bxt_guc_ver9_29.bin for module 
i915
W: Possible missing firmware /lib/firmware/i915/skl_guc_ver9_33.bin for module 
i915
/etc/kernel/postinst.d/zz-update-grub:
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
Found linux image: /boot/vmlinuz-4.19.0-041900rc3-lowlatency
Found initrd image: /boot/initrd.img-4.19.0-041900rc3-lowlatency
Found linux image: /boot/vmlinuz-4.19.0-041900rc3-generic
Found initrd image: /boot/initrd.img-4.19.0-041900rc3-generic
Found linux image: /boot/vmlinuz-4.15.0-34-generic
Found initrd image: /boot/initrd.img-4.15.0-34-generic
Found linux image: /boot/vmlinuz-4.15.0-29-generic
Found initrd image: /boot/initrd.img-4.15.0-29-generic
Adding boot menu entry for EFI firmware configuration
done


[3]
******************************
pooja@X1-Carbon-6:~/Desktop$ xinput --list-props 12
Device 'SynPS/2 Synaptics TouchPad':
        Device Enabled (153):   1
        Coordinate Transformation Matrix (155): 1.000000, 0.000000, 0.000000, 
0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        Device Accel Profile (276):     1
        Device Accel Constant Deceleration (277):       2.500000
        Device Accel Adaptive Deceleration (278):       1.000000
        Device Accel Velocity Scaling (279):    12.500000
        Synaptics Edges (302):  1574, 5370, 1350, 4502
        Synaptics Finger (303): 40, 40, 0
        Synaptics Tap Time (304):       180
        Synaptics Tap Move (305):       252
        Synaptics Tap Durations (306):  180, 180, 100
        Synaptics ClickPad (307):       1
        Synaptics Middle Button Timeout (308):  0
        Synaptics Two-Finger Pressure (309):    282
        Synaptics Two-Finger Width (310):       7
        Synaptics Scrolling Distance (311):     114, 114
        Synaptics Edge Scrolling (312): 1, 1, 1
        Synaptics Two-Finger Scrolling (313):   1, 1
        Synaptics Move Speed (314):     1.000000, 1.750000, 0.034874, 0.000000
        Synaptics Off (315):    2
        Synaptics Locked Drags (316):   0
        Synaptics Locked Drags Timeout (317):   5000
        Synaptics Tap Action (318):     2, 3, 0, 0, 1, 3, 0
        Synaptics Click Action (319):   1, 3, 0
        Synaptics Circular Scrolling (320):     0
        Synaptics Circular Scrolling Distance (321):    0.100000
        Synaptics Circular Scrolling Trigger (322):     0
        Synaptics Circular Pad (323):   0
        Synaptics Palm Detection (324): 0
        Synaptics Palm Dimensions (325):        10, 200
        Synaptics Coasting Speed (326): 20.000000, 50.000000
        Synaptics Pressure Motion (327):        30, 160
        Synaptics Pressure Motion Factor (328): 1.000000, 1.000000
        Synaptics Resolution Detect (329):      1
        Synaptics Grab Event Device (330):      0
        Synaptics Gestures (331):       1
        Synaptics Capabilities (332):   1, 0, 0, 1, 1, 1, 1
        Synaptics Pad Resolution (333): 1, 1
        Synaptics Area (334):   0, 0, 0, 0
        Synaptics Soft Button Areas (335):      3472, 0, 4098, 0, 0, 0, 0, 0
        Synaptics Noise Cancellation (336):     28, 28
        Device Product ID (271):        2, 7
        Device Node (272):      "/dev/input/event6"

tag:
'kernel-bug-exists-upstream'.


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

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https://bugs.launchpad.net/bugs/1791921

Title:
  Touchpad doesn't work at all after fresh installation of Ubuntu 16.04

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