What does the file /etc/X11/xorg.conf say for the option Emulate3Buttons? To find out quickly, at a terminal enter:
grep Emulate3Buttons /etc/X11/xorg.conf
If it does not say “true” (or “1”, “on” or “yes”), you could try changing this setting by at a terminal entering:
sudo dpkg-reconfigure xserver-xorg
Accept the current answers until you reach the “Emulate 3 button mouse?” question.
This is not a user-level option, which is presumably what you are looking for, so I shall leave the status of this report alone for now.
What does the file /etc/X11/xorg.conf say for the option Emulate3Buttons? To find out quickly, at a terminal enter:
grep Emulate3Buttons /etc/X11/xorg.conf
If it does not say “true” (or “1”, “on” or “yes”), you could try changing this
setting by at a terminal entering:
sudo dpkg-reconfigure xserver-xorg
Accept the current answers until you reach the “Emulate 3 button mouse?”
question.
This is not a user-level option, which is presumably what you are looking for,
so I shall leave the status of this report alone for now.