The "left-handed" option is also ticked in the dconf-editor. Anyway, it's ok now. Here's how I solved it:
Open dconf-editor, find org--gnome--settings-daemon--plugins--mouse, then tick "active". -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-settings-daemon in Ubuntu. https://bugs.launchpad.net/bugs/426675 Title: Left handed mouse settings no longer working after system update To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/426675/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs