Ubuntu 18.04 Ctrl+Scroll Won't Zoom in Chromium

After installing Ubuntu MATE 18.04 on my laptop, I noticed that my usual method of zooming a page with Ctrl+MouseWheeUp and Ctrl+MouseWheelDown wasn't working with my touchpad (with edge scrolling). It worked when I had Ubuntu 16.04.

This is what I did to fix it. Do these steps as root.

This solves it temporarily:

sudo modprobe -r psmouse && sudo modprobe psmouse proto=imps

Once I confirmed it worked, I made it permanent:

echo "options pmouse proto=imps" >/etc/modprobe.d/psmouse.conf && update-initramfs -uv