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.
--
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-input-libinput in Ubuntu.
https://bugs.launchpad.net/bugs/1758306
Title:
Cannot switch mouse primary button to Right (left-handed) in Settings
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1758306/+subscriptions
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