[21:29] <qwertrtuttu>  It is necessary to check. 19.04 with kernel 5.0.0-13, 5.0.0-15 mouse works with 6 buttons. At 19.10 with kerenel 5.0.0-13, 5.0.0-15 only 4 buttons work, in a red of the button do not work. Host Windows, Guest U-Mate 64. https://ibb.co/w7j1sPC https://ibb.co/9b8dHdJ https://ibb.co/ZBt0wJr
[23:37] <qwertrtuttu> New info. My mouse can work as usb and as ps2. My mouse is connected to the ps2 port via USB PS2 Converter and the mouse has a usb connector. I do not know why the mouse at 19.10 is defined only as ps2. https://ibb.co/wYFhdhn https://ibb.co/fXT6JTH
[23:38] <qwertrtuttu> 19.10 https://ibb.co/ZBt0wJr
[23:40] <qwertrtuttu> I have usb flash and usb flash mount in Guest 19.04 and 19.10 - ok, file i see, write, read - ok
[23:46] <qwertrtuttu> I think that due to the fact that at 19.04 the mouse is defined as and a usb device, there are 6 buttons in the mouse, not 4, but not 100% sure