Solution:
Ignore the talk of "/etc/X11/xorg.conf.d/" - if I put a file in there,
my USB keyboard fails to start, so I can't type anything.
Instead, add this to /etc/X11/xorg.conf:
### START FILE SNIPPET ###
Section "InputClass"
Identifier "Marble Mouse"
MatchProduct "Logitech USB Trackball"
MatchIsPointer "on"
MatchDevicePath "/dev/input/event*"
Driver "evdev"
Option "ButtonMapping" "1 8 3 4 5 6 7 2 9"
Option "EmulateWheel" "true"
Option "EmulateWheelButton" "9"
Option "ZAxisMapping" "4 5"
Option "XAxisMapping" "6 7"
Option "Emulate3Buttons" "false"
EndSection
### END FILE SNIPPET ###
Restart X (log out and back in, or reboot), and all should be well.
--
udev rules with dot in key fails with Env must be KEY=VALUE pairs
https://bugs.launchpad.net/bugs/567068
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