I had a similar problem. After upgrading to Xubuntu 17.04, the mouse was too fast but settings had no effects. I solved this problem with xinput. See comments in this bug report (may be a duplicate):
https://bugs.launchpad.net/ubuntu/+source/unity-control- center/+bug/1683145 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1682193 Title: Mouse acceleration significantly reduced after upgrade to 17.04 Status in xorg package in Ubuntu: Confirmed Bug description: My external Logitech USB mouse was behaving nicely under 16.10 but after upgrade to 17.04 it has slowed down to a crawl. Settings slidebars are set at the maximum acceleration, but it only affects the touch pad, the mouse is extremely slow. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1682193/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
