Same problem.
Change acceleration in mouse settings have no effects.
My keyboard and mouse appears in double (see image).

$ xinput
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ ARESON Wireless Mouse                     id=13   [slave  pointer  (2)]
⎜   ↳ ARESON Wireless Mouse                     id=14   [slave  pointer  (2)]
⎜   ↳ RAPOO Rapoo 2.4G Wireless Device          id=11   [slave  pointer  (2)]
⎜   ↳ RAPOO Rapoo 2.4G Wireless Device          id=10   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ Power Button                              id=8    [slave  keyboard (3)]
    ↳ Sleep Button                              id=9    [slave  keyboard (3)]
    ↳ RAPOO Rapoo 2.4G Wireless Device          id=12   [slave  keyboard (3)]
    ↳ Dell WMI hotkeys                          id=15   [slave  keyboard (3)]
    ↳ Dell AIO WMI hotkeys                      id=16   [slave  keyboard (3)]
    ↳ RAPOO Rapoo 2.4G Wireless Device          id=17   [slave  keyboard (3)]
    ↳ ARESON Wireless Mouse                     id=18   [slave  keyboard (3)]


Unable to change value above 1 :

$ xinput set-prop 13 "libinput Accel Speed" 5
X Error of failed request:  BadValue (integer parameter out of range for 
operation)
  Major opcode of failed request:  131 (XInputExtension)
  Minor opcode of failed request:  57 ()
  Value in failed request:  0x11f
  Serial number of failed request:  20
  Current serial number in output stream:  21

This is very troublesome.

If you want i am on call to give more information or diagnoses


** Attachment added: "mouse settings acceleration not work"
   
https://bugs.launchpad.net/ubuntu/+source/xfce4-settings/+bug/1758023/+attachment/5112504/+files/mouse_settings.png

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https://bugs.launchpad.net/bugs/1758023

Title:
  Mouse acceleration not configurable in Xubuntu 18.04

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