OK, bad news then... This appears to be a kernel/hardware bug unique to your laptop. It's pretty rare but I have also seen it before on Lenovo X230s (I think).
Next I suggest trying a live boot of Ubuntu 20.04: https://releases.ubuntu.com/20.04/ or just trying newer kernels: https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=M;O=D to see if a fix has already been released for this issue. ** Summary changed: - Grid-like cursor movement on touchpad + [Toshiba Portege R830] Grid-like cursor movement on touchpad ** Package changed: xserver-xorg-input-synaptics (Ubuntu) => linux (Ubuntu) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1886977 Title: [Toshiba Portege R830] Grid-like cursor movement on touchpad Status in linux package in Ubuntu: Incomplete Bug description: Moving cursor using touchpad goes in zigzag pattern, when moving diagonally. The laptop is Toshiba Portege R830 ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: libinput10 1.10.4-1ubuntu0.18.04.1 ProcVersionSignature: Ubuntu 5.3.0-62.56~18.04.1-generic 5.3.18 Uname: Linux 5.3.0-62-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.15 Architecture: amd64 CurrentDesktop: MATE Date: Thu Jul 9 17:35:34 2020 SourcePackage: libinput UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886977/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
