This issue, especially comment #7 looks very much like the issues I've been having since I installed Ubuntu on my desktop for the first time.

I have described the issue in this askubuntu post more in detail: https://askubuntu.com/questions/1286301/ubuntu-20-04-1-lts-mouse-removed-and-added-intermittently

Log messages when the issue occurs:
```
nov 08 19:33:19 trillian kernel: usb 2-1.4.2: USB disconnect, device number 15
nov 08 19:33:19 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) config/udev: removing device Logitech Gaming Mouse G400
nov 08 19:33:19 trillian /usr/lib/gdm3/gdm-x-session[3785]: (**) Option "fd" "78"
nov 08 19:33:19 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) event2  - Logitech Gaming Mouse G400: device removed
nov 08 19:33:19 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) UnloadModule: "libinput"
nov 08 19:33:19 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) systemd-logind: releasing fd for 13:66
nov 08 19:33:19 trillian kernel: usb 2-1.4.2: new full-speed USB device number 16 using ehci-pci
nov 08 19:33:20 trillian kernel: usb 2-1.4.2: New USB device found, idVendor=046d, idProduct=c245, bcdDevice=69.00
nov 08 19:33:20 trillian kernel: usb 2-1.4.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
nov 08 19:33:20 trillian kernel: usb 2-1.4.2: Product: Gaming Mouse G400
nov 08 19:33:20 trillian kernel: usb 2-1.4.2: Manufacturer: Logitech
nov 08 19:33:20 trillian kernel: input: Logitech Gaming Mouse G400 as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4.2/2-1.4.2:1.0/0003:046D:C245.0016/input/input29
nov 08 19:33:20 trillian kernel: hid-generic 0003:046D:C245.0016: input,hidraw0: USB HID v1.10 Mouse [Logitech Gaming Mouse G400] on usb-0000:00:1d.0-1.4.2/input0
nov 08 19:33:20 trillian kernel: hid-generic 0003:046D:C245.0017: hiddev0,hidraw1: USB HID v1.10 Device [Logitech Gaming Mouse G400] on usb-0000:00:1d.0-1.4.2/input1
nov 08 19:33:20 trillian mtp-probe[7109]: checking bus 2, device 16: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4.2"
nov 08 19:33:20 trillian mtp-probe[7109]: bus: 2, device: 16 was not an MTP device
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) config/udev: Adding input device Logitech Gaming Mouse G400 (/dev/input/mouse0)
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) No input driver specified, ignoring this device.
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) This device may have been added with another device file.
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[2421]: (II) config/udev: Adding input device Logitech Gaming Mouse G400 (/dev/input/mouse0)
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[2421]: (II) No input driver specified, ignoring this device.
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[2421]: (II) This device may have been added with another device file.
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[2421]: (II) config/udev: Adding input device Logitech Gaming Mouse G400 (/dev/input/event2)
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) config/udev: Adding input device Logitech Gaming Mouse G400 (/dev/input/event2)
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (**) Logitech Gaming Mouse G400: Applying InputClass "libinput pointer catchall"
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) Using input driver 'libinput' for 'Logitech Gaming Mouse G400'
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[2421]: (**) Logitech Gaming Mouse G400: Applying InputClass "libinput pointer catchall"
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[2421]: (II) Using input driver 'libinput' for 'Logitech Gaming Mouse G400'
nov 08 19:33:20 trillian mtp-probe[7117]: checking bus 2, device 16: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4.2"
nov 08 19:33:20 trillian mtp-probe[7117]: bus: 2, device: 16 was not an MTP device
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[2421]: (II) systemd-logind: got fd for /dev/input/event2 13:66 fd 27 paused 1
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[2421]: (II) systemd-logind: releasing fd for 13:66
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) systemd-logind: got fd for /dev/input/event2 13:66 fd 78 paused 0
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (**) Logitech Gaming Mouse G400: always reports core events
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (**) Option "Device" "/dev/input/event2"
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (**) Option "_source" "server/udev"
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) event2  - Logitech Gaming Mouse G400: is tagged by udev as: Mouse
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) event2  - Logitech Gaming Mouse G400: device set to 800 DPI
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) event2  - Logitech Gaming Mouse G400: device is a pointer
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) event2  - Logitech Gaming Mouse G400: device removed
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4.2/2-1.4.2:1.0/0003:046D:C245.0016/input/input29/event2"
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) XINPUT: Adding extended input device "Logitech Gaming Mouse G400" (type: MOUSE, id 8)
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (**) Option "AccelerationScheme" "none"
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (**) Logitech Gaming Mouse G400: (accel) selected scheme none/0
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (**) Logitech Gaming Mouse G400: (accel) acceleration factor: 2.000
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (**) Logitech Gaming Mouse G400: (accel) acceleration threshold: 4
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) event2  - Logitech Gaming Mouse G400: is tagged by udev as: Mouse
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) event2  - Logitech Gaming Mouse G400: device set to 800 DPI
nov 08 19:33:20 trillian /usr/lib/gdm3/gdm-x-session[3785]: (II) event2  - Logitech Gaming Mouse G400: device is a pointer
```