Two-Finger scrolling stopped working for ETPS/2 Elantech Touchpad

[Scalpel78]

Hi,
I've had Linux Mint installed for about 1.5 year. During that time the touchpad has worked just fine. Recently the two-finger scrolling has stopped working, and I can't for the life of me figure out why.

My computer is a Lenovo Ideapad 700, and I've added all available updates. Linux Mint18 4.13.0-37-generic.

If I do a live-boot from USB with either Linux Mint or Kali Linux, the touchpad works as I want, so I assume there is either a driver or a setting problem in my current Linux Mint installation causing the problem.

If I do a

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xinput | grep -i touch

it returns

ETPS/2 Elantech Touchpad id=13 [slave pointer (2)]

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synclient | grep -i Scroll

gives

VertScrollDelta = -74
HorizScrollDelta = -74
VertEdgeScroll = 0
HorizEdgeScroll = 0
VertTwoFingerScroll = 1
HorizTwoFingerScroll = 1
CircularScrolling = 0
CircScrollDelta = 0.1
CircScrollTrigger = 0

What else could I check or change to get scrolling via touchpad working?

[Scalpel78]

Ah, fixed it!

On my non-working Linux Mint it seems to use 'synaptics' driver, while when I live-usb boot (and the scrolling works) it uses 'libinput' driver.
Found that out by running

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grep "Using input driver" /var/log/Xorg.0.log"

Then the problem was fixed by running

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sudo apt-get install xserver-xorg-input-libinput