In my case, same thing than above: Logitech M310 middle button not working on
Ubuntu 18.04 => issued "xev | grep button" on a terminal, checked the left,
then the right and finally the middle/wheel buttons:
# xev | grep button
state 0x0, button 1, same_screen YES
state 0x100, button 1, same_screen YES
state 0x0, button 3, same_screen YES
state 0x400, button 3, same_screen YES
state 0x0, button 2, same_screen YES
state 0x200, button 2, same_screen YES
state 0x0, button 2, same_screen YES
state 0x200, button 2, same_screen YES
Then, just after closing the xev window, noticed the "middle mouse button
click/paste" suddenly started to work again. Weird...
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https://bugs.launchpad.net/bugs/1581088
Title:
Middle mouse (wheel-click) button stopped working after upgrade to
16.04
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