Comment 34 for bug 54191

This bug was actually fixed as a side effect of the Ubuntu installer not generating an xorg.conf anymore and letting X autodetect the hardware on startup instead. X by default does not enable the Emulate3Buttons flag (I speculate having this flag enabled in the default xorg.conf file was an Ubuntu-specific "feature"), so the problem is gone. I believe this "fix" first occurred in Jaunty, and the first LTS version that has it is Lucid. However, I also believe the Ubuntu upgrader keeps the old xorg.conf file, so merely upgrading to a current version won't make this problem (or the Emulate3Buttons flag that causes it) go away - this can only be accomplished by editing xorg.conf or by installing the current version from scratch.