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My touch pad was working when I first installed Ubuntu 18.04. I found similar problems with answers suggesting to update the kernel. Now those answers are old.

These are my system's properties:

Linux abolfazl 4.15.0-72-generic #81-Ubuntu SMP Tue Nov 26 12:20:02 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

 xinput list

⎡ Virtual core pointer                      id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  
⎜   ↳ USB OPTICAL MOUSE                         id=9    [slave  pointer  (
⎜   ↳ Synaptics TM3336-001                      id=11   [slave  pointer  (
⎣ Virtual core keyboard                     id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (
    ↳ Video Bus                                 id=6    [slave  keyboard (
    ↳ Video Bus                                 id=7    [slave  keyboard (
    ↳ Power Button                              id=8    [slave  keyboard (
    ↳ EasyCamera: EasyCamera                    id=10   [slave  keyboard (
    ↳ Ideapad extra buttons                     id=12   [slave  keyboard (
    ↳ AT Translated Set 2 keyboard              id=13   [slave  keyboard (

cat /etc/os-release
NAME="Ubuntu"
VERSION="18.04.3 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.3 LTS"
VERSION_ID="18.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=bionic
UBUNTU_CODENAME=bionic

Probably some updates caused the problem, but do you have any idea how to find a solution?

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