xserver-xorg-input-all was installed. As a result, both xserver-xorg-input synaptics and xserver-xorg-input-libinput got installed.
This breaks usage for both natural scrolling *and* moving the primary button of the mouse/touchpad to the right (a.k.a. typing while being left-handed).
Purging xserver-xorg-input-synaptics resolves it, with both natural scrolling and left-handedness now working.
This bug only affects Gnome; KDE and Unity work as expected.
ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: xserver-xorg-input-all (not installed)
ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
Uname: Linux 4.10.0-19-generic x86_64
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
.tmp.unity_support_test.0:
ApportVersion: 2.20.4-0ubuntu4
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME
Date: Sat Apr 22 14:44:44 2017
DistUpgraded: 2016-12-02 17:02:11,979 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py'
DistroCodename: zesty
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
Subsystem: CLEVO/KAPOK Computer 4th Gen Core Processor Integrated Graphics Controller [1558:0655]
InstallationDate: Installed on 2016-02-08 (439 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160205)
MachineType: System76, Inc. Gazelle Professional
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.10.0-19-generic root=/dev/mapper/ubuntu--vg-root ro text
SourcePackage: xorg
UpgradeStatus: Upgraded to zesty on 2016-12-02 (140 days ago)
dmi.bios.date: 08/15/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.00.05RS76
dmi.board.asset.tag: Tag 12345
dmi.board.name: Gazelle Professional
dmi.board.vendor: System76, Inc.
dmi.board.version: gazp9
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: System76, Inc.
dmi.chassis.version: gazp9
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.00.05RS76:bd08/15/2013:svnSystem76,Inc.:pnGazelleProfessional:pvrgazp9:rvnSystem76,Inc.:rnGazelleProfessional:rvrgazp9:cvnSystem76,Inc.:ct9:cvrgazp9:
dmi.product.name: Gazelle Professional
dmi.product.version: gazp9
dmi.sys.vendor: System76, Inc.
version.compiz: compiz 1:0.9.13.1+17.04.20170109-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.76-1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.0.3-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 17.0.3-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.3-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.9.0-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20170309-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.14-0ubuntu1
xserver.bootTime: Sat Apr 22 14:35:09 2017
xserver.configfile: default
xserver.errors:
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.19.3-1ubuntu1
xserver.video_driver: modeset
For 17.10, I think xserver-