2) I also discovered something new about this issue when I tested this on bionic. I _thought_ I observed this on artful, but I wasn't certain so I didn't mention it, but now I'm certain. Immediately after reboot, when I move the mouse (note I'm using Xorg, not Wayland), the mouse pointer on the screen moves for a fraction of a second and _then_ stops working at until I unplug the dongle and plug it back in again.
1) Just tested bionic, same behavior.
2) I also discovered something new about this issue when I tested this on bionic. I _thought_ I observed this on artful, but I wasn't certain so I didn't mention it, but now I'm certain. Immediately after reboot, when I move the mouse (note I'm using Xorg, not Wayland), the mouse pointer on the screen moves for a fraction of a second and _then_ stops working at until I unplug the dongle and plug it back in again.