Enable mouse middle button emulation on linux
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HowTo
Linux
Tools
Xorg
Last update
2020-08-25
2020
08-25
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xorg config

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# /etc/X11/xorg.conf.d/mouse-middle-bt.conf
Section "InputClass"
   Identifier "middle button"
   MatchIsPointer "on"
   MatchDriver "libinput"
   Option "MiddleEmulation" "on"
EndSection

live command

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xinput list # find the device ID/name
xinput list-props "USB Optical Mouse  Mouse" | grep -i middle
xinput set-prop   "USB Optical Mouse  Mouse" "libinput Middle Emulation Enabled" 1

Source: unix.stackexchange.com