Comment 40 for bug 1758306

Thank you Cas.
Let me answer to your suggestions.

Check all updates are installed? Try proposed updates?
I always install all updates.

Is this with mouse or trackpad?
I only use the trackpad.

Have you checked what gsettings is reporting?

    gsettings get org.gnome.desktop.peripherals.mouse left-handed
    true

Perhaps try a booting with a livecd ubuntu and test mouse there. I don't have a CD with Ubuntu 18.04.

I started using Ubuntu with version 12.04 and I have updated it to versions 14.04 and 16.04. The left-handed mode always worked fine. A couple of weeks ago, I was offered to install version 18.04. The bug started after the installation of this new version. I must say it is very annoying.