It sounds like you have a peripheral that's generating unwanted mouse wheel events. If the problem is still happening then please run 'xev' in a Terminal window and move the mouse pointer over the little white window. Now do you see new events being logged in the Terminal window?
** Package changed: gnome-shell (Ubuntu) => linux (Ubuntu) ** Also affects: libinput (Ubuntu) Importance: Undecided Status: New ** Also affects: mutter (Ubuntu) Importance: Undecided Status: New ** Summary changed: - chrome and gnome-terminal tabs moves to the last by itself + Phantom mouse wheel events without user input -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1905287 Title: Phantom mouse wheel events without user input To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libinput/+bug/1905287/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs