Related to this question, which was never really answered...
I'm running Debian Testing on a Lenovo Thinkpad T530.
I downloaded Pharo using the zeroconf script. About says
Pharo3.0
Latest update: #30860
I noticed that middle click didn't bring up the morphic halo as I expected, based on the description in Pharo by Example, nor did it do anything as far as I could tell.
I ran the Pharo VM with a Squeak image (as suggested by this answer), and middle mouse did exactly what I would have expected.
I couldn't find any more information about this, so I'm asking here.
Is there a way to enable the middle mouse? Is this a bug?
Try shift + middle click.
(I'm using Debian Testing on T520)