touchpad stopped working all of a sudden. Wired mouse still works. model is Thinkpad T440. Ubuntu 16.04

Thank you for taking the time to report this bug and helping to make Ubuntu better.

No details about your touchpad have been provided (make model etc), but if it's a Synaptics s3203, TM3108-002, TM2714-002 .. it's possible that this is a duplicate of https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1854798

If you look at your `dmesg` log you may find messages like the following providing detail on your actual hardware.

[ 2.111242] rmi4_f01 rmi4-00.fn01: found RMI device, manufacturer: Synaptics, product: s3203, fw id: 1522295
[ 2.124077] usb 2-5: new high-speed USB device number 3 using xhci_hcd
[ 2.175237] input: Synaptics s3203 as /devices/pci0000:00/INT33C3:00/i2c-0/i2c-DLL060A:00/0018:06CB:2734.0001/input/input6

NOTE: I copied that from the 1854798 bug report, so it won't likely match your system hardware.

I would suggest confirming your actual hardware (is it Synaptics models like I'm betting it is) as then the bug-fix outlined in that possible duplicate report will apply. Please report back here with results, and if you tried the suggestions in the duplicate link and they work.

FYI: Duplicate reports are far more useful than 'affects me to' clicks, so thank you for filing, and helping make Ubuntu better.

Sorry, this is my first time posting a bug and sorry for not providing enough information. Such a messy state of affairs my mind currently is. I shouldve posted the 'cat /proc/bus/input/devices' contents as well. It actually happened to previous laptop as well (Both using Ubuntu 16.04. My issue is solved by simply 'sudo apt-get upgrade', as well as as upgrading any 'kept back' packages. Thanks again, and sorry

just for the record:
cat /proc/bus/input/devices shows :
I: Bus=0019 Vendor=0000 Product=0005 Version=0000
N: Name="Lid Switch"
P: Phys=PNP0C0D/button/input0
S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0D:00/input/input0
U: Uniq=
H: Handlers=event0
B: PROP=0
B: EV=21
B: SW=1

I: Bus=0019 Vendor=0000 Product=0003 Version=0000
N: Name="Sleep Button"
P: Phys=PNP0C0E/button/input0
S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0E:00/input/input1
U: Uniq=
H: Handlers=kbd event1
B: PROP=0
B: EV=3
B: KEY=4000 0 0

I: Bus=0019 Vendor=0000 Product=0001 Version=0000
N: Name="Power Button"
P: Phys=LNXPWRBN/button/input0
S: Sysfs=/devices/LNXSYSTM:00/LNXPWRBN:00/input/input2
U: Uniq=
H: Handlers=kbd event2
B: PROP=0
B: EV=3
B: KEY=10000000000000 0

I: Bus=0011 Vendor=0001 Product=0001 Version=ab54
N: Name="AT Translated Set 2 keyboard"
P: Phys=isa0060/serio0/input0
S: Sysfs=/devices/platform/i8042/serio0/input/input3
U: Uniq=
H: Handlers=sysrq kbd event3 leds
B: PROP=0
B: EV=120013
B: KEY=402000000 3803078f800d001 feffffdfffefffff fffffffffffffffe
B: MSC=10
B: LED=7

I: Bus=0019 Vendor=0000 Product=0006 Version=0000
N: Name="Video Bus"
P: Phys=LNXVIDEO/video/input0
S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input6
U: Uniq=
H: Handlers=kbd event4
B: PROP=0
B: EV=3
B: KEY=3e000b00000000 0 0 0

I: Bus=0011 Vendor=0002 Product=0007 Version=01b1
N: Name="SynPS/2 Synaptics TouchPad"
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input5
U: Uniq=
H: Handlers=mouse0 event5
B: PROP=15
B: EV=b
B: KEY=e520 10000 0 0 0 0
B: ABS=660800011000003

I: Bus=0011 Vendor=0002 Product=000a Version=0000
N: Name="TPPS/2 IBM TrackPoint"
P: Phys=synaptics-pt/serio0/input0
S: Sysfs=/devices/platform/i8042/serio1/serio2/input/input7
U: Uniq=
H: Handlers=mouse1 event6
B: PROP=21
B: EV=7
B: KEY=70000 0 0 0 0
B: REL=3

I: Bus=0003 Vendor=04f2 Product=b39a Version=2603
N: Name="Integrated Camera: Integrated C"
P: Phys=usb-0000:00:14.0-8/button
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb2/2-8/2-8:1.0/input/input9
U: Uniq=
H: Handlers=kbd event7
B: PROP=0
B: EV=3
B: KEY=100000 0 0 0

I: Bus=0019 Vendor=17aa Product=5054 Version=4101
N: Name="ThinkPad Extra Buttons"
P: Phys=thinkpad_acpi/input0
S: Sysfs=/devices/platform/thinkpad_acpi/input/input8
U: Uniq=
H: Handlers=rfkill kbd event8
B: PROP=0
B: EV=33
B: KEY=10040 0 18040000 0 50100000000000 0 1701b02102004 c000280041114000 10e000000000000 0
B: MSC=10
B: SW=8

I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel HDMI HDMI/DP,pcm=3"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:03.0/sound/card0/input10
U: Uniq=
H: Handlers=event9
B: PROP=0
B: EV=21
B: SW=140

I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel HDMI HDMI/DP,pcm=7"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:03.0/sound/card0/input11
U: Uniq=
H: Handlers=event10
B: PROP=0
B: EV=21
B: SW=140

I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel HDMI HDMI/DP,pcm=8"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:03.0/sound/card0/input12
U: Uniq=
H: Handlers=event11
B: PROP=0
B: EV=21
B: SW=140

I: Bus=0000 Vendor=0000 Product=0000 Version=000...

Status changed to 'Confirmed' because the bug affects multiple users.